1.
Lavender (color)
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It applies particularly to the color of the flower of the same name. The color lavender might be described as a purple or a light pinkish purple. In paints, the color lavender is made by mixing purple, the first recorded use of the word lavender as a color term in English was in 1705. Originally, the name only applied to flowers. By 1930, the book A Dictionary of Color identified three major shades of lavender, lavender gray, and lavender blue, and in addition a fourth shade of lavender called old lavender. By 1955, the publication of the ISCC-NBS Dictionary of Color Names, now on the Internet, today, although the color floral lavender remains the standard for lavender, just as there are many shades of pink, there are many shades of lavender. Displayed at right is the web color lavender blush and it is a pale pinkish tone of lavender. The color designated as the web color lavender is a pale tint of lavender that in other contexts may be described as lavender mist. Displayed at right is the color languid lavender, the source of this color is the Plochere Color System, a color system formulated in 1948 that is widely used by interior designers. The historical name for this color is lavender gray and it is listed in A Dictionary of Color as one of the three major variations of lavender in 1930 along with lavender blue and lavender. This color is similar to Prismacolor colored pencil PC1026, Greyed Lavender, sample of lavender gray, ISCC-NBS Dictionary of Color Names —Color sample of lavender gray, The color soap is displayed at right. Soap is a color formulated by Crayola in 1994 as one of the colors in its Magic Scent specialty box of colors and this color is a representation of soap scented with lavender, one of the most popular scents for soap. At right is displayed the pale tint of lavender shown as lavender in sample 209 in the ISCC-NBS Dictionary of Color Names, Lavender blue was listed in A Dictionary of Color as one of the three major variations of lavender in 1930 along with lavender gray and lavender. It is identified as being the color as periwinkle. The first use of the term lavender blue as a term was in 1926. The color wisteria is displayed at right, wisteria, a light medium violet color is equivalent to light lavender. The Prismacolor colored pencil PC956, which used to be called light violet and is now called lilac is this color, wisteria in this exact shade is one of the Crayola crayon colors on the list of Crayola crayon colors. It was formulated as a Crayola color in 1993, the first recorded use of wisteria as a color name in English was in 1892
2.
Bract
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In botany, a bract is a modified or specialized leaf, especially one associated with a reproductive structure such as a flower, inflorescence axis, or cone scale. Bracts are often different from foliage leaves and they may be smaller, larger, or of a different color, shape, or texture. Typically, they look different from the parts of the flower. The state of having bracts is referred to as bracteate or bracteolate, some bracts are brightly colored and serve the function of attracting pollinators, either together with the perianth or instead of it. Examples of this type of bract include Euphorbia pulcherrima and Bougainvillea, in grasses, each floret is enclosed in a pair of papery bracts, called the lemma and palea, while each spikelet has a further pair of bracts at its base called glumes. These bracts form the chaff removed from cereal grain during threshing and winnowing, bats may detect acoustic signals from dish-shaped bracts such as those of Marcgravia evenia. A prophyll is a structure, such as a bracteole. The term can mean the lower bract on a peduncle. The frequently showy pair of bracts of Euphorbia species in subgenus Lacanthis are the cyathophylls, bracts subtend the cone scales in the seed cones of many conifers, and in some cases, such as Pseudotsuga, they extend beyond the cone scales. A small bract is called a bracteole or bractlet, technically this is any bract that arises on a pedicel instead of subtending it. Bracts that appear in a whorl subtending an inflorescence are called an involucre. An involucre is a common feature beneath the inflorescences of many Apiaceae, Asteraceae, Dipsacaceae and Polygonaceae, each flower in an inflorescence may have its own whorl of bracts, in this case called an involucel. In this case they may be called chaff, paleas, or receptacular bracts and are usually minute scales or bristles, many asteraceous plants have bracts at the base of each inflorescence. The term involucre is also used for a highly conspicuous bract or bract pair at the base of an inflorescence, in the family Betulaceae, notably in the genera Carpinus and Corylus, the involucre is a leafy structure that protects the developing nuts. Beggar-tick has narrow involucral bracts surrounding each inflorescence, each of which also has a bract below it. There is then a pair of bracts on the main stem. It is a calyx-like extra whorl of floral appendages, each individual segment of the epicalyx is called an episepal because they resemble the sepals. They are present in family Malvaceae, the Hibiscus family, fragaria may or may not have an epicalyx
3.
Taxonomy (biology)
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Taxonomy is the science of defining groups of biological organisms on the basis of shared characteristics and giving names to those groups. The exact definition of taxonomy varies from source to source, but the core of the remains, the conception, naming. There is some disagreement as to whether biological nomenclature is considered a part of taxonomy, the broadest meaning of taxonomy is used here. The word taxonomy was introduced in 1813 by Candolle, in his Théorie élémentaire de la botanique, the term alpha taxonomy is primarily used today to refer to the discipline of finding, describing, and naming taxa, particularly species. In earlier literature, the term had a different meaning, referring to morphological taxonomy, ideals can, it may be said, never be completely realized. They have, however, a value of acting as permanent stimulants. Some of us please ourselves by thinking we are now groping in a beta taxonomy, turrill thus explicitly excludes from alpha taxonomy various areas of study that he includes within taxonomy as a whole, such as ecology, physiology, genetics, and cytology. He further excludes phylogenetic reconstruction from alpha taxonomy, thus, Ernst Mayr in 1968 defined beta taxonomy as the classification of ranks higher than species. This activity is what the term denotes, it is also referred to as beta taxonomy. How species should be defined in a group of organisms gives rise to practical and theoretical problems that are referred to as the species problem. The scientific work of deciding how to define species has been called microtaxonomy, by extension, macrotaxonomy is the study of groups at higher taxonomic ranks, from subgenus and above only, than species. While some descriptions of taxonomic history attempt to date taxonomy to ancient civilizations, earlier works were primarily descriptive, and focused on plants that were useful in agriculture or medicine. There are a number of stages in scientific thinking. Early taxonomy was based on criteria, the so-called artificial systems. Later came systems based on a complete consideration of the characteristics of taxa, referred to as natural systems, such as those of de Jussieu, de Candolle and Bentham. The publication of Charles Darwins Origin of Species led to new ways of thinking about classification based on evolutionary relationships and this was the concept of phyletic systems, from 1883 onwards. This approach was typified by those of Eichler and Engler, the advent of molecular genetics and statistical methodology allowed the creation of the modern era of phylogenetic systems based on cladistics, rather than morphology alone. Taxonomy has been called the worlds oldest profession, and naming and classifying our surroundings has likely been taking place as long as mankind has been able to communicate
4.
Plant
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Plants are mainly multicellular, predominantly photosynthetic eukaryotes of the kingdom Plantae. The term is generally limited to the green plants, which form an unranked clade Viridiplantae. This includes the plants, conifers and other gymnosperms, ferns, clubmosses, hornworts, liverworts, mosses and the green algae. Green plants have cell walls containing cellulose and obtain most of their energy from sunlight via photosynthesis by primary chloroplasts and their chloroplasts contain chlorophylls a and b, which gives them their green color. Some plants are parasitic and have lost the ability to produce amounts of chlorophyll or to photosynthesize. Plants are characterized by sexual reproduction and alternation of generations, although reproduction is also common. There are about 300–315 thousand species of plants, of which the great majority, green plants provide most of the worlds molecular oxygen and are the basis of most of Earths ecologies, especially on land. Plants that produce grains, fruits and vegetables form humankinds basic foodstuffs, Plants play many roles in culture. They are used as ornaments and, until recently and in variety, they have served as the source of most medicines. The scientific study of plants is known as botany, a branch of biology, Plants are one of the two groups into which all living things were traditionally divided, the other is animals. The division goes back at least as far as Aristotle, who distinguished between plants, which generally do not move, and animals, which often are mobile to catch their food. Much later, when Linnaeus created the basis of the system of scientific classification. Since then, it has become clear that the plant kingdom as originally defined included several unrelated groups, however, these organisms are still often considered plants, particularly in popular contexts. When the name Plantae or plant is applied to a group of organisms or taxon. The evolutionary history of plants is not yet settled. Those which have been called plants are in bold, the way in which the groups of green algae are combined and named varies considerably between authors. Algae comprise several different groups of organisms which produce energy through photosynthesis, most conspicuous among the algae are the seaweeds, multicellular algae that may roughly resemble land plants, but are classified among the brown, red and green algae. Each of these groups also includes various microscopic and single-celled organisms
5.
Flowering plant
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The flowering plants, also known as Angiospermae or Magnoliophyta, are the most diverse group of land plants, with 416 families, approx. 13,164 known genera and a total of c.295,383 known species, etymologically, angiosperm means a plant that produces seeds within an enclosure, in other words, a fruiting plant. The term angiosperm comes from the Greek composite word meaning enclosed seeds, the ancestors of flowering plants diverged from gymnosperms in the Triassic Period, during the range 245 to 202 million years ago, and the first flowering plants are known from 160 mya. They diversified extensively during the Lower Cretaceous, became widespread by 120 mya, angiosperms differ from other seed plants in several ways, described in the table. These distinguishing characteristics taken together have made the angiosperms the most diverse and numerous land plants, the amount and complexity of tissue-formation in flowering plants exceeds that of gymnosperms. The vascular bundles of the stem are arranged such that the xylem and phloem form concentric rings, in the dicotyledons, the bundles in the very young stem are arranged in an open ring, separating a central pith from an outer cortex. In each bundle, separating the xylem and phloem, is a layer of meristem or active formative tissue known as cambium, the soft phloem becomes crushed, but the hard wood persists and forms the bulk of the stem and branches of the woody perennial. Among the monocotyledons, the bundles are more numerous in the stem and are scattered through the ground tissue. They contain no cambium and once formed the stem increases in diameter only in exceptional cases, the characteristic feature of angiosperms is the flower. Flowers show remarkable variation in form and elaboration, and provide the most trustworthy external characteristics for establishing relationships among angiosperm species, the function of the flower is to ensure fertilization of the ovule and development of fruit containing seeds. The floral apparatus may arise terminally on a shoot or from the axil of a leaf, occasionally, as in violets, a flower arises singly in the axil of an ordinary foliage-leaf. There are two kinds of cells produced by flowers. Microspores, which divide to become pollen grains, are the male cells and are borne in the stamens. The female cells called megaspores, which divide to become the egg cell, are contained in the ovule. The flower may consist only of parts, as in willow. Usually, other structures are present and serve to protect the sporophylls, the individual members of these surrounding structures are known as sepals and petals. The outer series is usually green and leaf-like, and functions to protect the rest of the flower, the inner series is, in general, white or brightly colored, and is more delicate in structure. It functions to attract insect or bird pollinators, attraction is effected by color, scent, and nectar, which may be secreted in some part of the flower
6.
Eudicots
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The eudicots, Eudicotidae or eudicotyledons are a monophyletic clade of flowering plants that had been called tricolpates or non-magnoliid dicots by previous authors. The close relationships among flowering plants with tricolpate pollen grains was initially seen in studies of shared derived characters. These plants have a trait in their pollen grains of exhibiting three colpi or grooves paralleling the polar axis. Later molecular evidence confirmed the basis for the evolutionary relationships among flowering plants with tricolpate pollen grains. The term means true dicotyledons, as it contains the majority of plants that have been considered dicots and have characteristics of the dicots, the term eudicots has subsequently been widely adopted in botany to refer to one of the two largest clades of angiosperms, monocots being the other. The remaining angiosperms are sometimes referred to as basal angiosperms or paleodicots, the other name for the eudicots is tricolpates, a name which refers to the grooved structure of the pollen. Members of the group have tricolpate pollen, or forms derived from it and these pollens have three or more pores set in furrows called colpi. In contrast, most of the seed plants produce monosulcate pollen. The name tricolpates is preferred by some botanists to avoid confusion with the dicots, numerous familiar plants are eudicots, including many common food plants, trees, and ornamentals. Most leafy trees of midlatitudes also belong to eudicots, with exceptions being magnolias and tulip trees which belong to magnoliids, and Ginkgo biloba. The name eudicots is used in the APG system, of 1998 and it is applied to a clade, a monophyletic group, which includes most of the dicots. The eudicots can be divided into two groups, the basal eudicots and the core eudicots, basal eudicot is an informal name for a paraphyletic group. The core eudicots are a monophyletic group, a 2010 study suggested the core eudicots can be divided into two clades, Gunnerales and a clade called Pentapetalae, comprising all the remaining core eudicots
7.
Asterids
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In the APG IV system for the classification of flowering plants, the name asterids denotes a clade. Most of the taxa belonging to this clade had been referred to the Asteridae in the Cronquist system, the name asterids resembles the earlier botanical name but is intended to be the name of a clade rather than a formal ranked name, in the sense of the ICBN. The phylogenetic tree presented hereafter has been proposed by the APG IV project, genetic analysis carried out after APG II maintains that the sister to all other asterids are the Cornales. A second order that split from the base of the asterids are the Ericales, the remaining orders cluster into two clades, the lamiids and the campanulids. The structure of both of these clades has changed in APG III, in APG III system, the following clades were renamed, euasterids I → lamiids euasterids II → campanulids Asterids in Stevens, P. F. Angiosperm Phylogeny Website
8.
Lamiales
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The Lamiales are an order in the asterid group of dicotyledonous flowering plants. It includes about 24,000 species divided into about 20 families, in the classification system of Dahlgren the Lamiales were in the superorder Lamiiflorae. Lamiales has become the name for this much larger combined group. The placement of the Boraginaceae is unclear, but phylogenetic work shows this family does not belong in Lamiales, Lamiales A parsimony analysis of the Asteridae sensu lato based on rbcL sequences Disintegration of the Scrophulariaceae L. Watson and M. J. Dallwitz. The families of flowering plants, descriptions, illustrations, identification, information retrieval
9.
Lamiaceae
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Lamiaceae or Labiatae is a family of flowering plants commonly known as the mint or deadnettle family. Many of the plants are aromatic in all parts and include widely used herbs, such as basil, mint, rosemary, sage, savory, marjoram, oregano, hyssop, thyme, lavender. Some species are shrubs, trees, or, rarely, vines, many members of the family are widely cultivated, not only for their aromatic qualities but also their ease of cultivation, since they are readily propagated by stem cuttings. Besides those grown for their leaves, some are grown for decorative foliage. Others are grown for seed, such as Salvia hispanica, or for their edible tubers, such as Plectranthus edulis, Plectranthus esculentus, Plectranthus rotundifolius, the family has a cosmopolitan distribution. The enlarged Lamiaceae contains about 236 genera and has stated to contain 6,900 to 7,200 species. The largest genera are Salvia, Scutellaria, Stachys, Plectranthus, Hyptis, Teucrium, Vitex, Thymus, Clerodendrum was once a genus of over 400 species, but by 2010, it had been narrowed to about 150. The original family name Labiatae refers to the fact that the flowers typically have petals fused into an upper lip, the flowers are bilaterally symmetrical with 5 united petals,5 united sepals. They are usually bisexual and verticillastrate, although this is still considered an acceptable alternative name, most botanists now use the name Lamiaceae in referring to this family. The leaves emerge oppositely, each pair at right angles to the one or whorled. The stems are square in cross section, but this is not found in all members of the family. The last revision of the family was published in 2004. It described and provided keys to 236 genera and these are marked with an asterisk in the list below. A few genera have been established or resurrected since 2004 and these are marked with a plus sign. The remaining genera in the list are mostly of historical interest only and are from a source that includes such genera without explanation, few of these are recognized in modern treatments of the family. Kew Gardens provides a list of genera that includes additional information, a list at the Angiosperm Phylogeny Website is frequently updated. The circumscription of genera has changed since 2004. Tsoongia, Paravitex, and Viticipremna have been sunk into synonymy with Vitex, huxleya has been sunk into Volkameria
10.
Carl Linnaeus
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Carl Linnaeus, also known after his ennoblement as Carl von Linné, was a Swedish botanist, physician, and zoologist, who formalised the modern system of naming organisms called binomial nomenclature. He is known by the father of modern taxonomy. Many of his writings were in Latin, and his name is rendered in Latin as Carolus Linnæus, Linnaeus was born in the countryside of Småland, in southern Sweden. He received most of his education at Uppsala University. He lived abroad between 1735 and 1738, where he studied and also published a first edition of his Systema Naturae in the Netherlands and he then returned to Sweden, where he became professor of medicine and botany at Uppsala. In the 1740s, he was sent on journeys through Sweden to find and classify plants. In the 1750s and 1760s, he continued to collect and classify animals, plants, and minerals, at the time of his death, he was one of the most acclaimed scientists in Europe. The philosopher Jean-Jacques Rousseau sent him the message, Tell him I know no man on earth. The German writer Johann Wolfgang von Goethe wrote, With the exception of Shakespeare and Spinoza, Swedish author August Strindberg wrote, Linnaeus was in reality a poet who happened to become a naturalist. Among other compliments, Linnaeus has been called Princeps botanicorum, The Pliny of the North and he is also considered as one of the founders of modern ecology. In botany, the abbreviation used to indicate Linnaeus as the authority for species names is L. In older publications, sometimes the abbreviation Linn. is found, Linnæus was born in the village of Råshult in Småland, Sweden, on 23 May 1707. He was the first child of Nicolaus Ingemarsson and Christina Brodersonia and his siblings were Anna Maria Linnæa, Sofia Juliana Linnæa, Samuel Linnæus, and Emerentia Linnæa. One of a line of peasants and priests, Nils was an amateur botanist, a Lutheran minister. Christina was the daughter of the rector of Stenbrohult, Samuel Brodersonius, a year after Linnæus birth, his grandfather Samuel Brodersonius died, and his father Nils became the rector of Stenbrohult. The family moved into the rectory from the curates house, even in his early years, Linnæus seemed to have a liking for plants, flowers in particular. Whenever he was upset, he was given a flower, which calmed him. Nils spent much time in his garden and often showed flowers to Linnaeus, soon Linnæus was given his own patch of earth where he could grow plants
11.
Type species
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A similar concept is used for suprageneric groups called a type genus. In botanical nomenclature, these terms have no standing under the code of nomenclature. In botany, the type of a name is a specimen which is also the type of a species name. The species name that has that type can also be referred to as the type of the genus name, names of genus and family ranks, the various subdivisions of those ranks, and some higher-rank names based on genus names, have such types. In bacteriology, a species is assigned for each genus. Every named genus or subgenus in zoology, whether or not currently recognized as valid, is associated with a type species. In practice, however, there is a backlog of untypified names defined in older publications when it was not required to specify a type, a type species is both a concept and a practical system that is used in the classification and nomenclature of animals. The type species represents the species and thus definition for a particular genus name. In the Glossary, type species is defined as The nominal species that is the type of a nominal genus or subgenus. The type species permanently attaches a formal name to a genus by providing just one species within that genus to which the name is permanently linked. The species name in turn is fixed, in theory, to a type specimen, for example, the type species for the land snail genus Monacha is Monacha cartusiana. That genus is placed within the family Hygromiidae. The type genus for that family is the genus Hygromia, the concept of the type species in zoology was introduced by Pierre André Latreille. The International Code of Zoological Nomenclature states that the name of the type species should always be cited. It gives an example in Article 67.1, Astacus marinus Fabricius,1775 was later designated as the type species of the genus Homarus, thus giving it the name Homarus marinus. However, the species of Homarus should always be cited using its original name. 3, the type of the genus name Elodes is quoted as the type of the species name Hypericum aegypticum, Glossary of scientific naming Genetypes – genetic sequence data from type specimens. Holotype Paratype Principle of Typification Type Type genus
12.
Lavandula spica
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Lavandula angustifolia, formerly L. officinalis, is a flowering plant in the family Lamiaceae, native to the Mediterranean. It is an aromatic shrub growing as high as 1 to 2 metres tall. The leaves are evergreen, 2–6 centimetres long, and 4–6 millimetres broad, the flowers are pinkish-purple, produced on spikes 2–8 cm long at the top of slender, leafless stems 10–30 cm long. The species name angustifolia is Latin for narrow leaf, previously, it was known as Lavandula officinalis, referring to its medicinal properties. English lavender is commonly grown as an ornamental plant and it is popular for its colourful flowers, its fragrance, and its ability to survive with low water consumption. It does not grow well in continuously damp soil and may benefit from increased drainage provided by inorganic mulches such as gravel and it does best in Mediterranean climates similar to its native habitat, characterized by wet winters and dry summers. It is fairly tolerant of low temperatures and is considered hardy to USDA zone 5. It tolerates acid soils but favours neutral to alkaline soils, very vigorous grower with a lovely strong fragrance. This has large deep Lavender-purple flowers on very long 24 inch stems, thought to be the original species lavender, harvested for its oil. The flowers and leaves are used as a medicine, either in the form of lavender oil or as an herbal tea. The flowers are used as a culinary herb, most often as part of the French herb blend called herbes de Provence. Lavender essential oil, when diluted with an oil, is commonly used as a relaxant with massage therapy. Products for home use, such as lotions, eye pillows and bath oils, both the petals and the oil are the most popular ingredients in handmade soap. Dried lavender flowers and lavender essential oil are used as a prevention against clothing moths. Lavandula angustifolia is included in the Tasmanian Fire Services list of low flammability plants, pyrenaica Lavandula hybrids are referred to as lavandins. Hybrids between L. angustifolia and L. latifolia are called Lavandula x intermedia and they bloom later than the ordinary English lavenders. Lavandula Xeriscaping Lavender fields in the Provence Lavandula angustifolia List of Chemicals
13.
Synonym (taxonomy)
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For example, Linnaeus was the first to give a scientific name to the Norway spruce, which he called Pinus abies. This name is no longer in use, it is now a synonym of the current scientific name which is Picea abies, unlike synonyms in other contexts, in taxonomy a synonym is not interchangeable with the name of which it is a synonym. In taxonomy, synonyms are not equals, but have a different status, for any taxon with a particular circumscription, position, and rank, only one scientific name is considered to be the correct one at any given time. A synonym cannot exist in isolation, it is always an alternative to a different scientific name, given that the correct name of a taxon depends on the taxonomic viewpoint used a name that is one taxonomists synonym may be another taxonomists correct name. Synonyms may arise whenever the same taxon is described and named more than once, independently. They may also arise when existing taxa are changed, as when two taxa are joined to one, a species is moved to a different genus. To the general user of scientific names, in such as agriculture, horticulture, ecology, general science. A synonym is a name that was used as the correct scientific name but which has been displaced by another scientific name. Thus Oxford Dictionaries Online defines the term as a name which has the same application as another. In handbooks and general texts, it is useful to have mentioned as such after the current scientific name. Synonyms used in this way may not always meet the strict definitions of the synonym in the formal rules of nomenclature which govern scientific names. Changes of scientific name have two causes, they may be taxonomic or nomenclatural, a name change may be caused by changes in the circumscription, position or rank of a taxon, representing a change in taxonomic, scientific insight. A name change may be due to purely nomenclatural reasons, that is, based on the rules of nomenclature, the earliest such name is called the senior synonym, while the later name is the junior synonym. One basic principle of zoological nomenclature is that the earliest correctly published name, synonyms are important because if the earliest name cannot be used, then the next available junior synonym must be used for the taxon. Objective synonyms refer to taxa with the type and same rank. For example, John Edward Gray published the name Antilocapra anteflexa in 1855 for a species of pronghorn, however, it is now commonly accepted that his specimen was an unusual individual of the species Antilocapra americana published by George Ord in 1815. Ords name thus takes precedence, with Antilocapra anteflexa being a subjective synonym. Objective synonyms are common at the level of genera, because for various reasons two genera may contain the type species, these are objective synonyms
14.
Genus
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A genus is a taxonomic rank used in the biological classification of living and fossil organisms in biology. In the hierarchy of classification, genus comes above species. In binomial nomenclature, the name forms the first part of the binomial species name for each species within the genus. Felis catus and Felis silvestris are two species within the genus Felis, Felis is a genus within the family Felidae. The composition of a genus is determined by a taxonomist, the standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. Moreover, genera should be composed of units of the same kind as other genera. The term comes from the Latin genus, a noun form cognate with gignere, linnaeus popularized its use in his 1753 Species Plantarum, but the French botanist Joseph Pitton de Tournefort is considered the founder of the modern concept of genera. The scientific name of a genus may be called the name or generic epithet. It plays a role in binomial nomenclature, the system of naming organisms. The rules for the names of organisms are laid down in the Nomenclature Codes. The standard way of scientifically describing species and other lower-ranked taxa is by binomial nomenclature, the generic name forms its first half. For example, the gray wolfs binomial name is Canis lupus, with Canis being the name shared by the wolfs close relatives. The specific name is written in lower-case and may be followed by names in zoology or a variety of infraspecific names in botany. Especially with these names, when the generic name is known from context. Because animals are typically only grouped within subspecies, it is written as a trinomen with a third name. Dog breeds, meanwhile, are not scientifically distinguished, there are several divisions of plant species and therefore their infraspecific names generally include contractions explaining the relation. For example, the genus Hibiscus includes hundreds of other species apart from the Rose of Sharon or common garden hibiscus, Rose of Sharon doesnt have subspecies but has cultivars that carry desired traits, such as the bright white H. syriaca Diana. Hawaiian hibiscus, meanwhile, includes several separate species, since not all botanists agree on the divisions or names between species, it is common to specify the source of the name using author abbreviations
15.
Family (biology)
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In biological classification, family is one of the eight major taxonomic ranks, it is classified between order and genus. A family may be divided into subfamilies, which are intermediate ranks above the rank of genus. In vernacular usage, a family may be named one of its common members, for example, walnuts and hickory trees belong to the family Juglandaceae. What does or does not belong to a family—or whether a family should be recognized at all—are proposed and determined by practicing taxonomists. There are no rules for describing or recognizing a family. Taxonomists often take different positions about descriptions of taxa, and there may be no broad consensus across the community for some time. Some described taxa are accepted broadly and quickly, but others only rarely, if at all, the naming of families is codified by various international codes. In zoological nomenclature, the names of animals end with the suffix -idae. The concept of rank at time was not yet settled, and in the preface to the Prodromus Magnol spoke of uniting his families into larger genera. Carolus Linnaeus used the word familia in his Philosophia botanica to denote groups of plants, trees, herbs, ferns, palms. He used this term only in the section of the book. In zoology, the family as an intermediate between order and genus was introduced by Pierre André Latreille in his Précis des caractères génériques des insectes. He used families in some but not in all his orders of insects, families can be used for evolutionary, palaeontological and generic studies because they are more stable than lower taxonomic levels such as genera and species
16.
Native plant
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Native plants are plants indigenous to a given area in geologic time. This includes plants that have developed, occur naturally, or existed for years in an area. Some native plants have adapted to limited, unusual environments or very harsh climates or exceptional soil conditions. Although some types of plants for these reasons exist only within a limited range. Research has found that insects depend on native plants, an ecosystem consists of interactions of plants, animals, and microorganisms with their physical and climatic conditions. Native plants form a part of an environment, or plant community. That could be a case if a plant exists because a certain animal pollinates the plant, some native plants rely on natural conditions, such as occasional wildfires, to release their seeds or to provide a fertile environment in which their seedlings can become established. As societies move plants or introduce them to new locations for cultivation as crops or ornamentals, some of them may become invasive species, besides ecological damage, these species can also damage agriculture, infrastructure, and cultural assets. Government agencies and environmental groups are directing increasing resources to addressing these species, non-native species can have profound effects on ecosystems by changing ecosystem structure, function, species abundance, and community composition. To prevent erosion of the sand dunes at the western edge of the Los Angeles International Airport in 1975. Unfortunately, the mix was representative of coastal sage scrub. As a result, the El Segundo blue butterfly became an endangered species, the rich diversity of unique species across many parts of the world exists only because bioregions are separated by barriers, particularly large rivers, seas, oceans, mountains and deserts. Humans, migratory birds, ocean currents, etc. can introduce species that have never met in their evolutionary history, humans are moving species across the globe at an unprecedented rate. Those working to address invasive species view this as a risk to indigenous species. The term nativar is becoming accepted as cultivars of native plants. The use of nativars is a widely disputed practice among native plant activists, the identification of local plant communities provides a basis for their work. Returning Essential Wildflowers to America’s Landscapes, Project Milkweed, Xerces Society Milkweeds are the required host plants for caterpillars of the monarch butterfly, mary M. Walker, Native Plant Societies of the United States and Canada. Introduced birds of the world, The worldwide history, distribution, New York, Universe Books, New York City, Sydney, Reed ISBN 0-589-50260-3 Vermeij, Geerat J.1991
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Old World
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The Old World consists of Africa, Europe, and Asia, regarded collectively as the part of the world known to Europeans before contact with the Americas. It is used in the context of, and contrast with and these regions were connected via the Silk Road trade route, and they have a pronounced Iron Age period following the Bronze Age. The concept of the three continents in the Old World, viz. Asia, Africa, and Europe, goes back to classical antiquity and their boundaries as defined by Ptolemy and other geographers of antiquity were drawn along the Nile and Don rivers. This definition remained influential throughout the Middle Ages and the Early Modern period, the Old world has areas of North Africa, Eurasia, parts of Papua New Guinea and Solomon Islands. The mainland of Afro-Eurasia has been referred to as the World Island, the term may have been coined by Sir Halford John Mackinder in The Geographical Pivot of History. The equivalent of the Old World had names in some of its ancient cultures, including Midgard in Germanic cosmology, synoptic table of the principal old world prehistoric cultures Afro-Eurasia
18.
Cape Verde
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Located 570 kilometres off the coast of West Africa, the islands cover a combined area of slightly over 4,000 square kilometres. The Cape Verde archipelago was uninhabited until the 15th century, when Portuguese explorers discovered and colonized the islands, ideally located for the Atlantic slave trade, the islands grew prosperous throughout the 16th and 17th centuries, attracting merchants, privateers, and pirates. The end of slavery in the 19th century led to economic decline, Cape Verde gradually recovered as an important commercial center and stopover for shipping routes. Incorporated as a department of Portugal in 1951, the islands continued to agitate for independence. Since the early 1990s, Cape Verde has been a representative democracy. Lacking natural resources, its economy is mostly service-oriented, with a growing focus on tourism. Its population of around 512,000 is mostly of mixed European and sub-Saharan African heritage, a sizeable diaspora community exists across the world, slightly outnumbering inhabitants on the islands. Historically, the name Cape Verde has been used in English for the archipelago and, since independence in 1975, for the country. In 2013, the Cape Verdean government determined that the Portuguese designation Cabo Verde would henceforth be used for official purposes, such as at the United Nations, Cape Verde is a member of the African Union. The name of the stems from the nearby Cap-Vert, on the Senegalese coast. In 1444 Portuguese explorers had named that landmark as Cabo Verde, on 24 October 2013, the countrys delegation announced at the United Nations that the official name should no longer be translated into other languages. Instead of Cape Verde, the designation Republic of Cabo Verde is to be used, before the arrival of Europeans, the Cape Verde Islands were uninhabited. The islands of the Cape Verde archipelago were discovered by Genoese and Portuguese navigators around 1456, according to Portuguese official records, the first discoveries were made by Genoa-born António de Noli, who was afterwards appointed governor of Cape Verde by Portuguese King Afonso V. Other navigators mentioned as contributing to discoveries in the Cape Verde archipelago are Diogo Gomes, Diogo Dias, Diogo Afonso, in 1462, Portuguese settlers arrived at Santiago and founded a settlement they called Ribeira Grande. Ribeira Grande was the first permanent European settlement in the tropics, in the 16th century, the archipelago prospered from the Atlantic slave trade. Pirates occasionally attacked the Portuguese settlements, sir Francis Drake, an English corsair privateering under a letter of marque granted by the English crown, twice sacked the capital Ribeira Grande in 1585 when it was a part of the Iberian Union. After a French attack in 1712, the town declined in relative to nearby Praia. Decline in the trade in the 19th century resulted in an economic crisis
19.
Canary Islands
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The Canary Islands, also known as the Canaries, are an archipelago and autonomous community of Spain located on the Atlantic Ocean,100 kilometres west of Morocco. The Canaries are among the outermost regions of the European Union proper and it is also one of the eight regions with special consideration of historical nationality recognized as such by the Spanish Government. The main islands are Tenerife, Fuerteventura, Gran Canaria, Lanzarote, La Palma, La Gomera, the archipelago also includes a number of islands and islets, La Graciosa, Alegranza, Isla de Lobos, Montaña Clara, Roque del Oeste and Roque del Este. In ancient times, the chain was often referred to as the Fortunate Isles. The Canary Islands is the most southerly region of Spain and the largest and most populated archipelago of the Macaronesia region, the islands have a subtropical climate, with long hot summers and moderately warm winters. The precipitation levels and the level of maritime moderation varies depending on location and elevation, green areas as well as desert exist on the archipelago. Due to their location above the inversion layer, the high mountains of these islands are ideal for astronomical observation. For this reason, two professional observatories, Teide Observatory on the island of Tenerife and Roque de los Muchachos Observatory on the island of La Palma, have built on the islands. Las Palmas de Gran Canaria has been the largest city in the Canaries since 1768, between the 1833 territorial division of Spain and 1927 Santa Cruz de Tenerife was the sole capital of the Canary Islands. In 1927 a decree ordered that the capital of the Canary Islands be shared, the third largest city of the Canary Islands is San Cristóbal de La Laguna on Tenerife. This city is home to the Consejo Consultivo de Canarias. During the time of the Spanish Empire, the Canaries were the main stopover for Spanish galleons on their way to the Americas, who came south to catch the prevailing northeasterly trade winds. The name Islas Canarias is likely derived from the Latin name Canariae Insulae, meaning Islands of the Dogs, according to the historian Pliny the Elder, the Mauretanian king Juba II named the island Canaria because it contained vast multitudes of dogs of very large size. Another speculation is that the dogs were actually a species of monk seal, critically endangered. The dense population of seals may have been the characteristic that most struck the few ancient Romans who established contact with these islands by sea. Alternatively, it is said that the inhabitants of the island, Guanches, used to worship dogs, mummified them. The ancient Greeks also knew about a people, living far to the west, who are the dog-headed ones, who worshipped dogs on an island. Some hypothesize that the Canary Islands dog-worship and the ancient Egyptian cult of the god, Anubis are closely connected
20.
Temperate climate
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In geography, temperate or tepid latitudes of Earth lie between the tropics and the polar regions. The temperatures in these regions are relatively moderate, rather than extremely hot or cold. The north temperate zone extends from the Tropic of Cancer to the Arctic Circle, the south temperate zone extends from the Tropic of Capricorn to the Antarctic Circle. In some climate classifications, the zone is often divided into several smaller climate zones. These include Humid subtropical climate, Mediterranean climate, oceanic, subtropical climates are located between 23. 5° and 35. 0° north or south latitude on the eastern or leeward sides of landmasses. This climate has long, generally hot, summers and short, mild winters and these climates may occur in southern Asia, the southeastern United States, parts of eastern Australia, and in eastern coastal South America. Mediterranean climates, occur between 30° and 42° north and south latitude, on the sides of landmasses. This climate has hot summers and short mild winters, however, seasonal rainfall is the opposite of that of the subtropical humid type. These climates occur near the rimlands of the Mediterranean Sea, in western Australia, in California, the oceanic climates occur in the higher middle latitudes, between 45° and 60° north and south latitude. They are created by the flow from the cool high latitude oceans to their west. This causes the climate to have cool summers and cool winters, annual rainfall is spread throughout the entire year. Regions with this climate include Western Europe, northwestern North America, the Continental climates occur in middle latitudes, between 35° or 40° to 55°. These climates are normally inland or on sides of landmasses. They feature warm to hot summers and cold winters, with a large temperature variation. Regions with this climate include northern temperate Asia, the northern United States, southern Canada, the vast majority of the worlds human population resides in temperate zones, especially in the northern hemisphere, due to its greater mass of land. The richest temperate flora in the world is found in southern Africa, geographical zone Habitat Köppen climate classification Middle latitudes Polar circle Subtropics
21.
Ornamental plant
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Ornamental plants are plants that are grown for decorative purposes in gardens and landscape design projects, as houseplants, for cut flowers and specimen display. The cultivation of these, called floriculture, forms a branch of horticulture. Commonly, ornamental plants are grown for the display of aesthetic features including, leaves, scent, overall foliage texture, fruit, stem and bark, and aesthetic form. In some cases, unusual features may be considered to be of interest, such as the prominent thorns of Rosa sericea, in all cases, their purpose is for the enjoyment of gardeners, visitors, and the public institutions. Similarly certain trees may be called ornamental trees and this term is used when they are used as part of a garden, park, or landscape setting, for instance for their flowers, their texture, form, size and shape, and other aesthetic characteristics. In some countries trees in utilitarian landscape use such as screening, for plants to be considered to be ornamental, they may require specific work and activity by a gardener. Ornamental plants and trees are distinguished from utilitarian and crop plants, such as used for agriculture and vegetable crops. This does not preclude any type of plant being grown both for ornamental qualities in the garden, and for utilitarian purposes in other settings. Thus lavender is typically grown as a plant in gardens. The term ornamental plant is used here in the sense that it is generally used in the horticultural trades. The term largely corresponds to garden plant, though the latter is less precise. Ornamental plants are plants which are grown for display purposes, rather than functional ones, Ornamental plants are the keystone of ornamental gardening, and they come in a range of shapes, sizes and colors suitable to a broad array of climates, landscapes, and gardening needs. Some ornamental plants are grown for showy foliage and their foliage may be deciduous, turning bright orange, red, and yellow before dropping off in the fall, or evergreen, in which case it stays green year-round. Other ornamental plants are cultivated for their blooms, flowering ornamentals are a key aspect of many gardens, with many flower gardeners preferring to plant a variety of flowers so that the garden is continuously in flower through the spring and summer. Media related to Ornamental plants at Wikimedia Commons
22.
Herb
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In general use, herbs are any plants used for food, flavoring, medicine, or fragrances for their savory or aromatic properties. Culinary use typically distinguishes herbs from spices, Herbs refers to the leafy green or flowering parts of a plant, while spices are produced from other parts of the plant, including seeds, berries, bark, roots and fruits. In botanical English, the herb is also used as a synonym of herbaceous plant. Herbs have a variety of uses including culinary, medicinal, and in some cases, general usage of the term herb differs between culinary herbs and medicinal herbs. In medicinal or spiritual use any of the parts of the plant might be considered herbs, including leaves, roots, flowers, seeds, root bark, inner bark, resin and pericarp. The word herb is pronounced /ˈhɜːrb/ in the UK, but /ˈɜːrb/ is common among North American speakers, as far back as 5000 BCE, Sumerians used herbs in medicine. Ancient Egyptians used fennel, coriander and thyme around 1555 BCE, in ancient Greece, in 162 CE, a physician by the name of Galen was known for concocting complicated herbal remedies that contained up to 100 ingredients. Culinary herbs are distinguished from vegetables in that, like spices, they are used in small amounts, Herbs can be perennials such as thyme or lavender, biennials such as parsley, or annuals like basil. Perennial herbs can be such as rosemary, Rosmarinus officinalis, or trees such as bay laurel, Laurus nobilis – this contrasts with botanical herbs. Some plants are used as herbs and spices, such as dill weed and dill seed or coriander leaves and seeds. Also, there are some such as those in the mint family that are used for both culinary and medicinal purposes. Some plants contain phytochemicals that have effects on the body, there may be some effects when consumed in the small levels that typify culinary spicing, and some herbs are toxic in larger quantities. For instance, some types of herbal extract, such as the extract of St. Johns-wort or of kava can be used for purposes to relieve depression. However, large amounts of these herbs may lead to toxic overload that may involve complications, some of a serious nature, Herbs have long been used as the basis of traditional Chinese herbal medicine, with usage dating as far back as the first century CE and far before. In India, the Ayurveda medicinal system is based on herbs, medicinal use of herbs in Western cultures has its roots in the Hippocratic elemental healing system, based on a quaternary elemental healing metaphor. Famous herbalist of the Western tradition include Avicenna, Galen, Paracelsus, Culpepper, the indigenous peoples of Australia developed herbal medicine based on plants that were readily available to them. The isolation of the people meant the remedies developed were for far less serious diseases. Herbs such as mint, wattle and eucalyptus were used for coughs, diarrhea, fever
23.
Essential oil
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Not to be confused with Essential fatty acid An essential oil is a concentrated hydrophobic liquid containing volatile aroma compounds from plants. Essential oils are known as volatile oils, ethereal oils, aetherolea, or simply as the oil of the plant from which they were extracted. An oil is essential in the sense that it contains the essence of the plants fragrance—the characteristic fragrance of the plant from which it is derived, Essential oils are generally extracted by distillation, often by using steam. Other processes include expression, solvent extraction, absolute oil extraction, resin tapping and they are used in perfumes, cosmetics, soaps and other products, for flavoring food and drink, and for adding scents to incense and household cleaning products. Essential oils have been used throughout history. The earliest recorded mention of the techniques and methods used to produce essential oils is believed to be that of Ibn al-Baitar, rather than refer to essential oils themselves, modern works typically discuss specific chemical compounds of which the essential oils are composed. For example, methyl salicylate rather than oil of wintergreen, interest in essential oils has revived in recent decades with the popularity of aromatherapy, a branch of alternative medicine that uses essential oils and other aromatic compounds. Oils are volatilized, diluted in an oil and used in massage, diffused in the air by a nebulizer, heated over a candle flame. Claims for the efficacy of treatments, and treatment of cancers in particular, are now subject to regulation in most countries. Most common essential oils such as lavender, peppermint, tea oil, patchouli. Raw plant material, consisting of the flowers, leaves, wood, bark, roots, seeds, as the water is heated, the steam passes through the plant material, vaporizing the volatile compounds. The vapors flow through a coil, where they condense back to liquid, most oils are distilled in a single process. One exception is ylang-ylang which is purifed through a fractional distillation, the recondensed water is referred to as a hydrosol, hydrolat, herbal distillate, or plant water essence, which may be sold as another fragrant product. Popular hydrosols include rose water, lavender water, lemon balm, clary sage, the use of herbal distillates in cosmetics is increasing. Some plant hydrosols have unpleasant smells and are not sold. Most citrus peel oils are expressed mechanically or cold-pressed, due to the relatively large quantities of oil in citrus peel and low cost to grow and harvest the raw materials, citrus-fruit oils are cheaper than most other essential oils. Lemon or sweet orange oils are obtained as byproducts of the citrus industry, before the discovery of distillation, all essential oils were extracted by pressing. Most flowers contain too little oil to undergo expression, but their chemical components are too delicate
24.
Lavandula angustifolia
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Lavandula angustifolia, formerly L. officinalis, is a flowering plant in the family Lamiaceae, native to the Mediterranean. It is an aromatic shrub growing as high as 1 to 2 metres tall. The leaves are evergreen, 2–6 centimetres long, and 4–6 millimetres broad, the flowers are pinkish-purple, produced on spikes 2–8 cm long at the top of slender, leafless stems 10–30 cm long. The species name angustifolia is Latin for narrow leaf, previously, it was known as Lavandula officinalis, referring to its medicinal properties. English lavender is commonly grown as an ornamental plant and it is popular for its colourful flowers, its fragrance, and its ability to survive with low water consumption. It does not grow well in continuously damp soil and may benefit from increased drainage provided by inorganic mulches such as gravel and it does best in Mediterranean climates similar to its native habitat, characterized by wet winters and dry summers. It is fairly tolerant of low temperatures and is considered hardy to USDA zone 5. It tolerates acid soils but favours neutral to alkaline soils, very vigorous grower with a lovely strong fragrance. This has large deep Lavender-purple flowers on very long 24 inch stems, thought to be the original species lavender, harvested for its oil. The flowers and leaves are used as a medicine, either in the form of lavender oil or as an herbal tea. The flowers are used as a culinary herb, most often as part of the French herb blend called herbes de Provence. Lavender essential oil, when diluted with an oil, is commonly used as a relaxant with massage therapy. Products for home use, such as lotions, eye pillows and bath oils, both the petals and the oil are the most popular ingredients in handmade soap. Dried lavender flowers and lavender essential oil are used as a prevention against clothing moths. Lavandula angustifolia is included in the Tasmanian Fire Services list of low flammability plants, pyrenaica Lavandula hybrids are referred to as lavandins. Hybrids between L. angustifolia and L. latifolia are called Lavandula x intermedia and they bloom later than the ordinary English lavenders. Lavandula Xeriscaping Lavender fields in the Provence Lavandula angustifolia List of Chemicals
25.
Herbaceous plant
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Herbaceous plants are plants that have no persistent woody stem above ground. Herbaceous plants may be annuals, biennials or perennials, annual herbaceous plants die completely at the end of the growing season or when they have flowered and fruited, and they then grow again from seed. Herbaceous perennial and biennial plants may have stems that die at the end of the growing season, but parts of the plant survive under or close to the ground from season to season. New growth develops from living tissues remaining on or under the ground, including roots, examples of herbaceous biennials include carrot, parsnip and common ragwort, herbaceous perennials include potato, peony, hosta, mint, most ferns and most grasses. Some relatively fast-growing herbaceous plants are pioneers, or early-successional species, others form the main vegetation of many stable habitats, occurring for example in the ground layer of forests, or in naturally open habitats such as meadow, salt marsh or desert. Some herbaceous plants can grow large, such as the Musa genus. The age of some herbaceous plants can be determined by analyzing annual growth rings in the secondary root xylem
26.
Perennial plant
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A perennial plant or simply perennial is a plant that lives for more than two years. The term is used to differentiate a plant from shorter-lived annuals and biennials. The term is widely used to distinguish plants with little or no woody growth from trees and shrubs. Tomato vines, for example, live several years in their natural habitat but are grown as annuals in temperate regions because they dont survive the winter. There is also a class of evergreen, or non-herbaceous, perennials, an intermediate class of plants is known as subshrubs, which retain a vestigial woody structure in winter, e. g. Penstemon. The local climate may dictate whether plants are treated as shrubs or perennials, for instance, many varieties of Fuchsia are shrubs in warm regions, but in colder temperate climates may be cut to the ground every year as a result of winter frosts. The symbol for a plant, based on Species Plantarum by Linnaeus, is. Perennial plants can be short-lived or they can be long-lived, as are some plants like trees. They include an assortment of plant groups from ferns and liverworts to the highly diverse flowering plants like orchids. Plants that flower and fruit only once and then die are termed monocarpic or semelparous, however, most perennials are polycarpic, flowering over many seasons in their lifetime. Perennials typically grow structures that allow them to adapt to living one year to the next through a form of vegetative reproduction rather than seeding. These structures include bulbs, tubers, woody crowns, rhizomes plus others and they might have specialized stems or crowns that allow them to survive periods of dormancy over cold or dry seasons during the year. Many perennials have developed specialized features that allow them to extreme climatic. Some have adapted to hot and dry conditions or cold temperatures. Those plants tend to invest a lot of resource into their adaptations and often do not flower, Many perennials produce relatively large seeds, which can have an advantage, with larger seedlings produced after germination that can better compete with other plants. Some annuals produce many seeds per plant in one season, while some perennials are not under the same pressure to produce large numbers of seeds. In warmer and more favorable climates, perennials grow continuously, in seasonal climates, their growth is limited to the growing season. In some species, perennials retain their foliage all year round, other plants are deciduous perennials, for example, in temperate regions a perennial plant may grow and bloom during the warm part of the year, with the foliage dying back in the winter
27.
Subshrub
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A subshrub or dwarf shrub is a short woody plant. Prostrate shrub is a related term, subshrub is often used interchangeably with bush. Subshrubs may be herbaceous, with overwintering perennial woody growth much lower-growing than deciduous summer growth. Some plants described as subshrubs are only weakly woody and some persist for only for a few years, others however, such as Oldenburgia paradoxa live indefinitely, rooted in rocky cracks. Small, low shrubs such as lavender, periwinkle, and thyme, the significance of the closeness to the ground is that the buds remain within the soil surface layer and are thus somewhat protected from various adverse influences. g. Banksia or Eucalyptus regrow from a lignotuber or caudex, heavily grazed or overgrazed ecosystems, such as tortoise turf The term chamaephyte is most formally used within the context of Raunkiær plant life-forms. Examples of chamaephytes are many of the species of the maquis and other plants of submediterranean dry ecosystems, others include heather species, African wild olive and edelweiss
28.
Shrub
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A shrub or bush is a small to medium-sized woody plant. It is distinguished from a tree by its multiple stems and shorter height, plants of many species may grow either into shrubs or trees, depending on their growing conditions. Small, low shrubs, generally less than 2 m tall, such as lavender, periwinkle, an area of cultivated shrubs in a park or a garden is known as a shrubbery. When clipped as topiary, suitable species or varieties of shrubs develop dense foliage, many shrubs respond well to renewal pruning, in which hard cutting back to a stool results in long new stems known as canes. Other shrubs respond better to selective pruning to reveal their structure, shrubs in common garden practice are generally considered broad-leaved plants, though some smaller conifers such as mountain pine and common juniper are also shrubby in structure. Species that grow into a shrubby habit may be deciduous or evergreen
29.
Glossary of leaf morphology
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The following is a defined list of terms which are used to describe leaf morphology in the description and taxonomy of plants. Leaves may be simple or compound, the edge of the leaf may be regular or irregular, may be smooth or bearing hair, bristles or spines. For more terms describing other aspects of leaves besides their overall morphology see the leaf article, leaves of most plants include a flat structure called the blade or lamina, but not all leaves are flat, some are cylindrical. Leaves may be simple, with a leaf blade, or compound. In flowering plants, as well as the blade of the leaf, there may be a petiole and stipules, leaf structure is described by several terms that include, Being one of the more visible features, leaf shape is commonly used for plant identification. Edge and margin are both interchangeable in the sense that they refer to the perimeter of a leaf. Leaves may also be folded or rolled in various ways, the folding of leaves within a bud is vernation, ptyxis is the folding of an individual leaf in a bud
30.
Pinnation
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Pinnation is the arrangement of feather-like or multi-divided features arising from both sides of a common axis. Pinnation occurs in biological morphology, in crystals, such as forms of ice or metal crystals. The term derives from the Latin word pinna meaning feather, wing, a similar concept is pectination, which is a comb-like arrangement of parts. Pinnation is commonly referred to in contrast to palmation, in which the parts or structures radiate out from a common point. The terms pinnation and pennation are cognate, and although they are used distinctly. Botanically, pinnation is an arrangement of structures arising at multiple points along a common axis. For example, once-divided leaf blades having leaflets arranged on both sides of a rachis are pinnately compound leaves, many palms and most cycads and grevilleas have pinnately divided leaves. Most species of ferns have pinnate or more highly divided fronds, plants with pinnate leaves are sometimes colloquially called feather-leaved. Pinnatisect, cut all the way to the midrib or other axis, pinnate-pinnatifid, pinnate, with the pinnae being pinnatifid. Paripinnate, pinnately compound leaves in which leaflets are born in pairs along the rachis without a terminal leaflet. Imparipinnate, pinnately compound leaves in which there is a terminal leaflet rather than a terminal pair of leaflets. Bipinnate, pinnately compound leaves in which the leaflets are themselves pinnately compound, tripinnate, pinnately compound leaves in which the leaflets are themselves bipinnate, also called thrice-pinnate. Tetrapinnate, pinnately compound leaves in which the leaflets are themselves tripinnate, unipinnate, solitary compound leaf with a row of leaflets arranged along each side of a common rachis. The term pinnula is the Latin diminutive of pinna, either as such or in the Anglicised form, pinnule, some apply it to the leaflets of a pinna, especially the leaflets of bipinnate or tripinnate leaves. Others also or alternatively apply it second or third divisions of a bipinnate or tripinnate leaf. It is the ultimate division of a compound leaf, or a pinnate subdivision of a multipinnate leaf. Pinnation occurs in certain systems in which all major tributary streams enter the main channels by flowing in one direction at an oblique angle
31.
Whorl (botany)
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In botany, a whorl is an arrangement of sepals, petals, leaves, stipules or branches that radiate from a single point and surround or wrap around the stem. A whorl consists of at least three elements, a pair of leaves is not called a whorl. A flower lacking any of these structures is said to be incomplete or imperfect. Not all flowers consist of whorls since the parts may instead be spirally arranged, for leaves to grow in whorls is fairly unusual except in plant species with very short internodes. It does however occur in some such as Brabejum stellatifolium and other Proteaceae. In examples such as illustrated, crowded internodes within the whorls alternate with long internodes between the whorls
32.
Meristem
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A meristem is the tissue in most plants containing undifferentiated cells, found in zones of the plant where growth can take place. Meristematic cells give rise to organs of the plant and keep the plant growing. The shoot apical meristem gives rise to organs like the leaves and flowers, SAM and RAM cells divide rapidly and are considered indeterminate, in that they do not possess any defined end status. In that sense, the cells are frequently compared to the stem cells in animals. The term meristem was first used in 1858 by Karl Wilhelm von Nägeli in his book Beiträge zur Wissenschaftlichen Botanik and it is derived from the Greek word merizein, meaning to divide, in recognition of its inherent function. In general, differentiated plant cells cannot divide or produce cells of a different type, therefore, cell division in the meristem is required to provide new cells for expansion and differentiation of tissues and initiation of new organs, providing the basic structure of the plant body. Meristematic cells are incompletely or not at all differentiated, and are capable of continued cellular division, furthermore, the cells are small and protoplasm fills the cell completely. The cytoplasm does not contain differentiated plastids, although they are present in rudimentary form, meristematic cells are packed closely together without intercellular cavities. The cell wall is a thin primary cell wall. Maintenance of the cells requires a balance between two processes, organ initiation and stem cell population renewal. Apical meristems are the completely undifferentiated meristems in a plant and these differentiate into three kinds of primary meristems. The primary meristems in turn produce the two secondary meristem types and these secondary meristems are also known as lateral meristems because they are involved in lateral growth. At the meristem summit, there is a group of slowly dividing cells. Cells of this zone have a stem cell function and are essential for meristem maintenance, the proliferation and growth rates at the meristem summit usually differ considerably from those at the periphery. Meristems also are induced in the roots of such as soybean, Lotus japonicus, pea. Cells of the inner or outer cortex in the window of nodulation just behind the developing root tip are induced to divide. The critical signal substance is the lipo-oligosaccharide Nod-factor, decorated with groups to allow specificity of interaction. The Nod factor receptor proteins NFR1 and NFR5 were cloned from several legumes including Lotus japonicus, Medicago truncatula, regulation of nodule meristems utilizes long distance regulation commonly called Autoregulation of Nodulation
33.
Sepal
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A sepal is a part of the flower of angiosperms. Usually green, sepals typically function as protection for the flower in bud, the term sepalum was coined by Noël Martin Joseph de Necker in 1790, and derived from the Greek σκεπη, a covering. Collectively the sepals are called the calyx, the outermost whorl of parts that form a flower, the word calyx was adopted from the Latin calyx, not to be confused with calix, a cup or goblet. Calyx derived from the Greek κάλυξ, a bud, a calyx, a husk or wrapping, while derived from the Greek κυλιξ, a cup or goblet. After flowering, most plants have no use for the calyx which withers or becomes vestigial. Some plants retain a thorny calyx, either dried or live, examples include species of Acaena, some of the Solanaceae, and the water caltrop, Trapa natans. In some species the calyx not only persists after flowering, but instead of withering and this is an effective protection against some kinds of birds and insects, for example in Hibiscus trionum and the Cape gooseberry. Morphologically, both sepals and petals are modified leaves, the calyx and the corolla are the outer sterile whorls of the flower, which together form what is known as the perianth. The term tepal is usually applied when the parts of the perianth are difficult to distinguish, e. g. the petals and sepals share the same color, or the petals are absent and the sepals are colorful. When the undifferentiated tepals resemble petals, they are referred to as petaloid, as in petaloid monocots, since they include Liliales, an alternative name is lilioid monocots. Examples of plants in which the term tepal is appropriate include genera such as Aloe, in contrast, genera such as Rosa and Phaseolus have well-distinguished sepals and petals. The number of sepals in a flower is its merosity, flower merosity is indicative of a plants classification. The merosity of a flower is typically four or five. The merosity of a monocot or palaeodicot flower is three, or a multiple of three, the development and form of the sepals vary considerably among flowering plants. They may be free or fused together, often, the sepals are much reduced, appearing somewhat awn-like, or as scales, teeth, or ridges. Most often such structures protrude until the fruit is mature and falls off, examples of flowers with much reduced perianths are found among the grasses. In some flowers, the sepals are fused towards the base, in other flowers a hypanthium includes the bases of sepals, petals, and the attachment points of the stamens
34.
Petal
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Petals are modified leaves that surround the reproductive parts of flowers. They are often brightly colored or unusually shaped to attract pollinators, together, all of the petals of a flower are called a corolla. Petals are usually accompanied by another set of special leaves called sepals, the calyx and the corolla together make up the perianth. When the petals and sepals of a flower are difficult to distinguish, examples of plants in which the term tepal is appropriate include genera such as Aloe and Tulipa. Conversely, genera such as Rosa and Phaseolus have well-distinguished sepals and petals, when the undifferentiated tepals resemble petals, they are referred to as petaloid, as in petaloid monocots, orders of monocots with brightly coloured tepals. Since they include Liliales, a name is lilioid monocots. Although petals are usually the most conspicuous parts of animal-pollinated flowers, wind-pollinated species, such as the grasses, the role of the corolla in plant evolution has been studied extensively since Charles Darwin postulated a theory of the origin of elongated corollae and corolla tubes. If the petals are free from one another in the corolla, the corolla in some plants forms a tube. Petals can differ dramatically in different species, the number of petals in a flower may hold clues to a plants classification. For example, flowers on eudicots most frequently have four or five petals while flowers on monocots have three or six petals, although there are exceptions to this rule. The petal whorl or corolla may be radially or bilaterally symmetrical. If all of the petals are essentially identical in size and shape, many flowers are symmetrical in only one plane and are termed irregular or zygomorphic. In irregular flowers, other parts may be modified from the regular form. Examples of zygomorphic flowers may be seen in orchids and members of the pea family, in many plants of the aster family such as the sunflower, Helianthus annuus, the circumference of the flower head is composed of ray florets. Each ray floret is anatomically an individual flower with a large petal. Florets in the centre of the disc typically have no or very reduced petals, in some plants such as Narcissus the lower part of the petals or tepals are fused to form a floral cup above the ovary, and from which the petals proper extend. Petal often consists of two parts, the upper, broad part, similar to leaf blade, called the limb, claws are developed in petals of some flowers of the family Brassicaceae, such as Erysimum cheiri. The inception and further development of shows a great variety of patterns
35.
Lavandula stoechas
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Lavandula stoechas is a species of flowering plant in the family Lamiaceae, occurring naturally in Mediterranean countries. An evergreen shrub, it grows to 30–100 cm tall. The leaves are 1–4 cm long, greyish and tomentose, at the top of the spike are a number of much larger, sterile bracts, 10–50 mm long and bright lavender purple. The recognised subspecies are, L. stoechas pedunculata, the common type specific plant, there is considerable variation in this subspecies, and it may be split into a number of distinct forms. It is native to coastal regions of the Mediterranean, with some populations on the Atlantic coasts of Morocco. L. stoechas luisieri, which has much less interconnected. It is found mainly in Portugal and adjacent regions of Spain and this species is more fragile than common lavender, as it is less winter hardy, but harsher and more resinous in its oils. Like other lavenders, it is associated with hot, dry, however, it tolerates a range of situations, though it may be short-lived. Selected forms are grown as ornamental plants, the cultivar Willow Vale has gained the Royal Horticultural Societys Award of Garden Merit. L. stoechas is used commercially in air fresheners and insecticides, flower spikes have been used internally for headaches, irritability, feverish colds and nausea, and externally for wounds, rheumatic pain and as an insect repellent. Since its introduction into Australia, it has become an invasive species and it has been declared a noxious weed in Victoria since 1920. It also is regarded as a weed in parts of Spain
36.
Lavandula dentata
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Lavandula dentata is a species of flowering plant in the Lamiaceae family, native to the Mediterranean, the Atlantic islands and the Arabian peninsula. Growing to 60 cm tall, it has gray-green, linear or lance-shaped leaves with toothed edges, the long-lasting, narrow spikes of purple flowers, topped with pale violet bracts, first appear in late spring. The whole plant is aromatic with the typical lavender fragrance. Its native habitat includes low hills with limestone substrates amidst other shrubs and it is present on Madeira and the Canary Islands. One of several species known by the English common name French lavender, it is grown as an ornamental plant. Like other lavenders, it is associated with dry, sunny. But it will tolerate a range of conditions, though it may be short-lived, the cultivar L. dentata var. dentata Royal Crown has gained the Royal Horticultural Societys Award of Garden Merit. It requires some shelter in frost-prone areas, the plant is used in Murcia as an herbal remedy for stomach ache. Common Spanish names include, alhucema inglesa, alhucema rizada, cantueso, cantueso dentado, cantueso rizado, espliego dentado, and garlanda
37.
Species Plantarum
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Species Plantarum is a book by Carl Linnaeus, originally published in 1753, which lists every species of plant known at the time, classified into genera. It is the first work to consistently apply binomial names and was the point for the naming of plants. Species Plantarum was published on 1 May 1753 by Laurentius Salvius in Stockholm, a second edition was published in 1762–1763, and a third edition in 1764, although this scarcely differed from the second. Species Plantarum was the first botanical work to apply the binomial nomenclature system of naming to any large group of organisms. The use of names had originally been developed as a kind of shorthand in a student project about the plants eaten by cattle. After the specific epithet, Linnaeus gave a description of each species. Because it is the first work in which binomial nomenclature was consistently applied, Species Plantarum contained descriptions of the thousands of plant species known to Linnaeus at the time. In the first edition, there were 5,940 names, in his introduction, Linnaeus estimated that there were fewer than 10,000 plant species in existence, there are now thought to be around 400,000 species of flowering plants alone. The species were arranged in around a thousand genera, which were grouped into 24 classes, 1–2 at Biodiversity Heritage Library facsimile Species Plantarum, vol. 1, vol.2 at Botanicus Species Plantarum at Project Guttenberg I-III IV-V VI-X XI-XIII text Linnaeus Link Union Catalogue
38.
Lavandula multifida
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Lavandula multifida is a small plant, sometimes a shrub, native to the southern regions of the Mediterranean, including Iberia, Sicily and the Canary Islands. The stems are grey and wooly, dark blue or blue violet flowers are borne on long stems held above the foliage. It is grown both as a herb and as an ornamental plant, in cooler latitudes it is killed by winter frost, but can be grown as an annual. Mediterranean Plants Identification and Distribution from the University of Reading University of Oklahoma Department of Botany & Microbiology The University of Reading
39.
Lavandula
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Lavandula is a genus of 47 known species of flowering plants in the mint family, Lamiaceae. It is native to the Old World and is found from Cape Verde and the Canary Islands, Europe across to northern and eastern Africa, the Mediterranean, southwest Asia to southeast India. The most widely cultivated species, Lavandula angustifolia, is referred to as lavender. The genus includes annual or short-lived herbaceous perennial plants, and shrub-like perennials, leaf shape is diverse across the genus. They are simple in some commonly cultivated species, in other species they are pinnately toothed, or pinnate, sometimes multiple pinnate, in most species the leaves are covered in fine hairs or indumentum, which normally contain the essential oils. Flowers are borne in whorls, held on spikes rising above the foliage, some species produce coloured bracts at the apices. The flowers may be blue, violet or lilac in the wild species, the corolla is also tubular, usually with five lobes. L. stoechas, L. pedunculata and L. dentata were known in Roman times, from the Middle Ages onwards, the European species were considered two separate groups or genera, Stoechas and Lavandula, until Linnaeus combined them. He only recognised five species in Species Plantarum, L. multifida and L. dentata and L. stoechas, L. pedunculata was included within L. stoechas. By 1790, L. pinnata and L. carnosa were recognised, the latter was subsequently transferred to Anisochilus. By 1826 Frédéric Charles Jean Gingins de la Sarraz listed 12 species in three sections, and by 1848 eighteen species were known, one of the first modern major classifications was that of Dorothy Chaytor in 1937 at Kew. The six sections she proposed for 28 species still left many intermediates that could not easily be assigned and her sections included Stoechas, Spica, Subnudae, Pterostoechas, Chaetostachys and Dentatae. However all the cultivated and commercial forms resided in the Stoechas. There were four species within Stoechas while Spica had three and she believed that the garden varieties were hybrids between true lavender L. angustifolia and spike lavender. More recently, work has been done by Upson and Andrews, subgenus Lavandula is mainly of woody shrubs with entire leaves. It contains the species grown as ornamental plants and for oils. They are found across the Mediterranean region to northeast Africa and western Arabia, subgenus Fabricia consists of shrubs and herbs, and it has a wide distribution from the Atlantic to India. Subgenus Sabaudia constitutes two species in the southwest Arabian peninsula and Eritrea, which are distinct from the other species
40.
Spica
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Spica, also designated Alpha Virginis, is the brightest star in the constellation of Virgo and the 16th brightest star in the night sky. Analysis of its shows that it is located 250 ±10 light years from the Sun. The primary is a giant and a variable star of the Beta Cephei type. Spica, along with Denebola or Regulus depending on the source and Arcturus, is part of the Spring Triangle asterism, as one of the nearest massive binary star systems to the Sun, Spica has been the subject of many observational studies. Spica is believed to be the star that gave Hipparchus the data led him to discover the precession of the equinoxes. A temple to Menat at Thebes was oriented with reference to Spica when it was built in 3200 BC, nicolaus Copernicus made many observations of Spica with his home-made triquetrum for his researches on precession. Spica is 2.05 degrees from the ecliptic and can be occulted by the Moon, the last planetary occultation of Spica occurred when Venus passed in front of the star on November 10,1783. The next occultation will occur on September 2,2197, when Venus again passes in front of Spica, the Sun passes a little more than 2° north of Spica around October 16 every year, and the stars heliacal rising occurs about two weeks later. Every 8 years, Venus passes Spica around the time of the heliacal rising. A method of finding Spica is to follow the arc of the handle of the Big Dipper to Arcturus and this can be recalled by the mnemonic phrase, arc to Arcturus and spike to Spica. Spica is a binary star whose components orbit about each other every four days. They stay close together that they cannot be resolved as two stars through a telescope. The changes in the motion of this pair results in a Doppler shift in the absorption lines of their respective spectra. Initially, the parameters for this system were inferred using spectroscopic measurements. The primary star has a classification of B1 III–IV. The luminosity class matches the spectrum of a star that is midway between a subgiant and a giant star, and it is no longer a B-type main-sequence star and this is a massive star with more than 10 times the mass of the Sun and seven times the Suns radius. The total luminosity of this star is about 12,100 times that of the Sun, the primary is one of the nearest stars to the Sun that has enough mass to end its life in a Type II supernova explosion. The primary is classified as a Beta Cephei-type variable star that varies in brightness over a 0. 1738-day period, the spectrum shows a radial velocity variation with the same period, indicating that the surface of the star is regularly pulsating outward and then contracting
41.
Lavandula latifolia
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Hybridization can occur in the wild with English lavender. The scent of Lavandula latifolia is stronger, with more camphor, for this reason the two varieties are grown in separate fields. Lavandula latifolia is an aromatic shrub growing to 30–80 cm tall. The leaves are evergreen, 3–6 cm long and 5–8 mm broad, the flowers are pale lilac, produced on spikes 2–5 cm long at the top of slender, leafless stems 20–50 cm long. Flowers from June to September depending on weather, the fruit is a nut, indehiscent, monosperm of hardened pericarp. It consists of 4 small nuts which often remain locked inside the calyx tube, grows from 0 to 1,700 m amsl. The species name latifolia is Latin for broadleaf, the genus name Lavandula simply means lavender. D-Camphor Eucalyptol d-Borneol α-Pinene β-Pinene Caryophyllene d-Camphene Guaiazulene Linalool Geraniol Lavandula latifolia can be used in aromatherapy, blumenthal M, Goldberg A, Brinckmann J. Herbal Medicine, Expanded Commission E Monographs. Grases F, Melero G, Costa-Bauza A et al, int Urol Nephrol 1994,26, 507-11. Paris RR, Moyse H. Matière Médicale, blumenthal M, Goldberg A, Brinckmann J. Herbal Medicine, Expanded Commission E Monographs. Grases F, Melero G, Costa-Bauza A i cols, int Urol Nephrol 1994,26, 507-11. Paris RR, Moyse H. Matière Médicale
42.
Honey bee
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A honey bee is any bee member of the genus Apis, primarily distinguished by the production and storage of honey and the construction of perennial, colonial nests from wax. Currently, only seven species of bee are recognized, with a total of 44 subspecies, though historically. The best known honey bee is the Western honey bee which has been domesticated for honey production, Honey bees represent only a small fraction of the roughly 20,000 known species of bees. Some other types of related bees produce and store honey, including the stingless honey bees, the study of bees including honey bees is known as melittology. The genus name Apis is Latin for bee, nonetheless, compounds gradually solidify in the orthography of natural languages in ways that do not always comply with prescription. Honey bees appear to have their center of origin in South and Southeast Asia, notably, living representatives of the earliest lineages to diverge have their center of origin there. The first Apis bees appear in the record at the Eocene–Oligocene boundary. The origin of these prehistoric honey bees does not necessarily indicate Europe as the place of origin of the genus, few fossil deposits are known from South Asia, the suspected region of honey bee origin, and fewer still have been thoroughly studied. No Apis species existed in the New World during human times before the introduction of A. mellifera by Europeans, only one fossil species is documented from the New World, Apis nearctica, known from a single 14-million-year-old specimen from Nevada. The close relatives of modern honey bees – e. g. bumblebees and stingless bees – are also social to some degree, most species have historically been cultured or at least exploited for honey and beeswax by humans indigenous to their native ranges. Only two of these species have been domesticated, one at least since the time of the building of the Egyptian pyramids. Honey bees are the extant members of the tribe Apini. Todays honey bees constitute three clades, the chromosome counts of female bees for the three clades are, Micrapis 2N =16, Megapis 2N =16, and Apis 2N =32. Drones of all species have 1N chromosome counts, the genome of Apis has been mapped. Drones are produced from unfertilized eggs, so represent only the DNA of the queen that laid the eggs, workers and queens result from fertilized eggs, so have both a mother and a father. Arrhenotokous parthenogenesis, a form of parthenogenesis, controls sex differentiation. The sex allele is polymorphic, and so long as two different variants are present, a female bee results, if both sex alleles are identical, diploid drones are produced. Honey bees detect and destroy diploid drones after the eggs hatch, queens typically mate with multiple drones on more than one mating flight
43.
Cultivar
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The term cultivar most commonly refers to an assemblage of plants selected for desirable characteristics that are maintained during propagation. More generally, cultivar refers to the most basic classification category of cultivated plants governed by the ICNCP, most cultivars have arisen in cultivation, but a few are special selections from the wild. Popular ornamental garden plants like roses, camellias, daffodils, rhododendrons, trees used in forestry are also special selections grown for their enhanced quality and yield of timber. Cultivars form a part of Liberty Hyde Baileys broader grouping. Cultivar was coined by Bailey and it is regarded as a portmanteau of cultivated and variety. A cultivar is not the same as a variety, a taxonomic rank below subspecies. In recent times, the naming of cultivars has been complicated by the use of statutory plant patents, the International Union for the Protection of New Varieties of Plants offers legal protection of plant cultivars to people or organisations who introduce new cultivars to commerce. UPOV requires that a cultivar be distinct, uniform and stable, to be distinct, it must have characteristics that easily distinguish it from any other known cultivar. To be uniform and stable, the cultivar must retain these characteristics under repeated propagation, a cultivar is given a cultivar name, which consists of the scientific Latin botanical name followed by a cultivar epithet. The cultivar epithet is usually in a vernacular language, for example, the full cultivar name of the King Edward potato is Solanum tuberosum King Edward. The King Edward part of the name is the cultivar epithet, the origin of the term cultivar arises from the need to distinguish between wild plants and those with characteristics that have arisen in cultivation. This distinction dates back to the Greek philosopher Theophrastus, the Father of Botany, botanical historian Alan Morton notes that Theophrastus in his Enquiry into Plants had an inkling of the limits of culturally induced changes and of the importance of genetic constitution. In Species Plantarum, Linnaeus listed all the known to him. Most of the listed by Linnaeus were of garden origin rather than being wild plants. Over time there was an increasing need to distinguish between plants growing in the wild, and those with variations that had produced in cultivation. In the nineteenth century many garden-derived plants were given names, sometimes in Latin. In the twentieth century an improved international terminology was proposed for the classification and it is essentially the equivalent of the botanical variety except in respect to its origin. However, Bailey was never explicit about the etymology of the word, and it has suggested that it is a contraction of the words cultigen and variety
44.
Invasive species
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One study pointed out widely divergent perceptions of the criteria for invasive species among researchers and concerns with the subjectivity of the term invasive. Such invasive species may be either plants or animals and may disrupt by dominating a region, wilderness areas, particular habitats and this includes non-native invasive plant species labeled as exotic pest plants and invasive exotics growing in native plant communities. It has been used in this sense by government organizations as well as groups such as the International Union for Conservation of Nature. The European Union defines Invasive Alien Species as those that are, firstly, outside their natural distribution area and it is also used by land managers, botanists, researchers, horticulturalists, conservationists, and the public for noxious weeds. The kudzu vine, Andean Pampas grass, and yellow starthistle are examples, an alternate usage broadens the term to include indigenous or native species along with non-native species, that have colonized natural areas. Deer are an example, considered to be overpopulating their native zones and adjacent suburban gardens, by some in the Northeastern, sometimes the term is used to describe a non-native or introduced species that has become widespread. However, not every introduced species has adverse effects on the environment, a nonadverse example is the common goldfish, which is found throughout the United States, but rarely achieves high densities. Scientists include species and ecosystem factors among the mechanisms that when combined, while all species compete to survive, invasive species appear to have specific traits or specific combinations of traits that allow them to outcompete native species. In some cases, the competition is about rates of growth, in other cases, species interact with each other more directly. Researchers disagree about the usefulness of traits as invasiveness markers, one study found that of a list of invasive and noninvasive species, 86% of the invasive species could be identified from the traits alone. Another study found invasive species tended to have only a subset of the presumed traits. Repeated patterns of movement, such as ships sailing to and from ports or cars driving up. An introduced species might become if it can outcompete native species for resources such as nutrients, light, physical space, water. If these species evolved under great competition or predation, then the new environment may host fewer able competitors, allowing the invader to proliferate quickly. Ecosystems in which are being used to their fullest capacity by native species can be modeled as zero-sum systems in which any gain for the invader is a loss for the native, however, such unilateral competitive superiority is not the rule. For example, barbed goatgrass was introduced to California on serpentine soils, which have low water-retention, low nutrient levels, a high magnesium/calcium ratio, and possible heavy metal toxicity. Plant populations on these soils tend to low density, but goatgrass can form dense stands on these soils. Some species, like Kalanchoe daigremontana, produce allelopathic compounds, that might have an effect on competing species
