Aponogeton crispus is an aquatic plant species. Ruffled / Crinkled or Wavy-edged Aponogeton. Native to southern India and Sri Lanka, where it occurs in seasonal ponds, becoming dormant in the dry season, Aponogeton crispus is found in both still and running waters, it is a seasonally submerged aquatic plant with a round rhizome 2 -- up to 5 cm in diameter. The leaves are light green to olive green-brown, 8 – 14 inches long and 2.5 inches broad, with a wavy margin and a petiole up to 18 inches long. No floating leaves are formed; the flowers are produced on an erect stem up to 80 cm tall with an apical white spike-like raceme up to 18 cm long. The flowers are scented, a flowering spike will last 1 – 2 weeks; the seeds are 5 -- 6 mm long and 2 mm diameter. Many plants sold in the aquarium trade are hybrids and many are sterile; the genuine plant never has leaves. It is a protected plant in Sri Lanka, where A. crispus is banned from exportation under Section 24 of Forest Ordinance. Aponogeton crispus is cultivated as an aquarium plant and is the easiest and most robust of the aponogetons.
It requires a mineral-rich substrate where carbon dioxide is available in the form of carbonic acid. It prefers moderate to bright lighting from above, will tolerate a wide temperature range, c. 15 – 32C. It does better planted in an established aquarium because of its liking for a nutrient rich environment; when these conditions are met a mass of leaves will be formed and flowering will occur. It doesn't need a dormant period under aquarium conditions but will sometimes lose its larger leaves and can be rested in cooler water for about two months. A. crispus is one of the aponogetons that require a dry storage during a dormancy, of which the onset is recognized by the gradual ripening off and loss of leaves. Propagation is by seed or by splitting the rhizome; the seeds have two prolongations which in horizontal position get curved and stuck into marshy ground forming the initial roots. Flowers can be pollinated with a soft brush and the resulting seeds sown in a propagater at normal room temperatures.
They take several weeks to germinate. When both leaves and roots can be seen they can be potted in a peat-based compost and covered with water. Tropica Krib article
Aponogeton natans is a species of aquatic plant, in genus Aponogeton. The plant is found in Sri Lanka; the plant is a submerged aquatic plant
Tubers are enlarged structures in some plant species used as storage organs for nutrients. They are used for the plant's perennation, to provide energy and nutrients for regrowth during the next growing season, as a means of asexual reproduction. Stem tubers form thickened stolons. Common plant species with stem tubers include yam; some sources treat modified lateral roots under the definition. The term originates from Latin tuber, meaning "lump, swelling"; some sources define the term "tuber" to mean only structures derived from stems. A stem tuber forms from thickened stolons; the top sides of the tuber produce shoots that grow into typical stems and leaves and the under sides produce roots. They tend to form at the sides of the parent plant and are most located near the soil surface; the underground stem tuber is a short-lived storage and regenerative organ developing from a shoot that branches off a mature plant. The offsprings or new tubers are attached to a parent tuber or form at the end of a hypogeogenous rhizome.
In the autumn the plant dies, except for the new offspring stem tubers which have one dominant bud, which in spring regrows a new shoot producing stems and leaves, in summer the tubers decay and new tubers begin to grow. Some plants form smaller tubers and/or tubercules which act like seeds, producing small plants that resemble seedlings; some stem tubers are long-lived, such as those of tuberous begonia, but many plants have tubers that survive only until the plants have leafed out, at which point the tuber is reduced to a shriveled-up husk. Stem tubers start off as enlargements of the hypocotyl section of a seedling but sometimes include the first node or two of the epicotyl and the upper section of the root; the stem tuber has a vertical orientation with one or a few vegetative buds on the top and fibrous roots produced on the bottom from a basal section the stem tuber has an oblong rounded shape. Tuberous begonia and Cyclamen are grown stem tubers. Mignonette vine produces aerial stem tubers on 12-to-25-foot-tall vines, the tubers fall to the ground and grow.
Plectranthus esculentus of the mint family Lamiaceae, produces tuberous under ground organs from the base of the stem, weighing up to 1.8 kg per tuber, forming from axillary buds producing short stolons that grow into tubers. Potatoes are stem tubers. Enlarged stolons thicken to develop into storage organs; the tuber has all the parts including nodes and internodes. The nodes are the eyes and each has a leaf scar; the nodes or eyes are arranged around the tuber in a spiral fashion beginning on the end opposite the attachment point to the stolon. The terminal bud is produced at the farthest point away from the stolon attachment and tubers thus show the same apical dominance as a normal stem. Internally, a tuber is filled with starch stored in enlarged parenchyma like cells; the inside of a tuber has the typical cell structures of any stem, including a pith, vascular zones, a cortex. The tuber is produced in one growing season and used to perennate the plant and as a means of propagation; when fall comes, the above-ground structure of the plant dies, but the tubers survive over winter underground until spring, when they regenerate new shoots that use the stored food in the tuber to grow.
As the main shoot develops from the tuber, the base of the shoot close to the tuber produces adventitious roots and lateral buds on the shoot. The shoot produces stolons that are long etiolated stems; the stolon elongates during long days with the presence of high auxins levels that prevent root growth off of the stolon. Before new tuber formation begins, the stolon must be a certain age; the enzyme lipoxygenase makes a hormone, jasmonic acid, involved in the control of potato tuber development. The stolons are recognized when potato plants are grown from seeds; as the plants grow, stolons are produced around the soil surface from the nodes. The tubers form close to the soil surface and sometimes on top of the ground; when potatoes are cultivated, the tubers are planted much deeper into the soil. Planting the pieces deeper creates more area for the plants to generate the tubers and their size increases; the pieces sprout shoots. These shoots generate short stolons from the nodes while in the ground.
When the shoots reach the soil surface, they produce roots and shoots that grow into the green plant. A tuberous root or storage root, is a modified lateral root, enlarged to function as a storage organ; the enlarged area of the root-tuber, or storage root, can be produced at the end or middle of a root or involve the entire root. It is thus similar in function and appearance to a stem tuber. Examples of plants with notable tuberous roots include the sweet potato and dahlia. Root tubers are perennating organs, thickened roots that store nutrients over periods when the plant cannot grow, thus permitting survival from one year to the next; the massive enlargement of secondary roots represented by sweet potato, have the internal and external cell and tissue structures of a normal root, they produce adventitious roots and stems which again produce adventitious roots. In root-tubers, there are reduced leaves. Root tubers have one end called the proximal end, the end
Australasia comprises Australia, New Zealand, some neighbouring islands. It is used in a number of different contexts including geopolitically, physiographically, ecologically where the term covers several different but related regions. Charles de Brosses coined the term in Histoire des navigations, he derived it from the Latin for "south of Asia" and differentiated the area from Polynesia and the southeast Pacific. In Australia "Australasia" is considered to be Australia, New Zealand, New Guinea, the neighbouring islands of the Pacific, while in New Zealand it means Australia, New Zealand and former New Zealand dependencies. Richards, Kel. "Australasia". Wordwatch. ABC News Radio. Retrieved 2006-09-30. Media related to Australasia at Wikimedia Commons
In botany and dendrology, a rhizome is a modified subterranean plant stem that sends out roots and shoots from its nodes. Rhizomes are called creeping rootstalks or just rootstalks. Rhizomes grow horizontally; the rhizome retains the ability to allow new shoots to grow upwards. A rhizome is the main stem of the plant. A stolon is similar to a rhizome, but a stolon sprouts from an existing stem, has long internodes, generates new shoots at the end, such as in the strawberry plant. In general, rhizomes have short internodes, send out roots from the bottom of the nodes, generate new upward-growing shoots from the top of the nodes. A stem tuber is a thickened part of a rhizome or stolon, enlarged for use as a storage organ. In general, a tuber is high in starch, e.g. the potato, a modified stolon. The term "tuber" is used imprecisely and is sometimes applied to plants with rhizomes. If a rhizome is separated each piece may be able to give rise to a new plant; the plant uses the rhizome to store starches and other nutrients.
These nutrients become useful for the plant when new shoots must be formed or when the plant dies back for the winter. This is a process known as vegetative reproduction and is used by farmers and gardeners to propagate certain plants; this allows for lateral spread of grasses like bamboo and bunch grasses. Examples of plants that are propagated this way include hops, ginger, lily of the valley and sympodial orchids; some rhizomes which are used directly in cooking include ginger, galangal and lotus. Stored rhizomes are subject to bacterial and fungal infections, making them unsuitable for replanting and diminishing stocks. However, rhizomes can be produced artificially from tissue cultures; the ability to grow rhizomes from tissue cultures leads to better stocks for replanting and greater yields. The plant hormones ethylene and jasmonic acid have been found to help induce and regulate the growth of rhizomes in rhubarb. Ethylene, applied externally was found to affect internal ethylene levels, allowing easy manipulations of ethylene concentrations.
Knowledge of how to use these hormones to induce rhizome growth could help farmers and biologists producing plants grown from rhizomes more cultivate and grow better plants. Some plants have rhizomes that grow above ground or that lie at the soil surface, including some Iris species, ferns, whose spreading stems are rhizomes. Plants with underground rhizomes include gingers, the Venus flytrap, Chinese lantern, western poison-oak and Alstroemeria, the weeds Johnson grass, Bermuda grass, purple nut sedge. Rhizomes form a single layer, but in giant horsetails, can be multi-tiered. Many rhizomes have culinary value, some, such as zhe'ergen, are consumed raw. Aspen Corm Mycorrhiza Media related to Rhizomes at Wikimedia Commons The Rhizome Collective for sustainable living
Ornamental plants are plants that are grown for decorative purposes in gardens and landscape design projects, as houseplants, cut flowers and specimen display. The cultivation of ornamental plants is called floriculture, which forms a major branch of horticulture. Ornamental plants are grown for the display of aesthetic features including: flowers, scent, overall foliage texture, fruit and bark, aesthetic form. In some cases, unusual features may be considered to be of interest, such as the prominent thorns of Rosa sericea and cacti. In all cases, their purpose is for the enjoyment of gardeners and the public institutions. Certain trees may be called ornamental trees; 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 and shape, other aesthetic characteristics. In some countries trees in'utilitarian' landscape use such as screening, roadside plantings are called amenity trees. Ornamental grasses are grasses grown as ornamental plants.
Many ornamental grasses are true grasses, however several other families of grass-like plants are marketed as ornamental grasses. These include the sedges, rushes and cat-tails. All are monocotyledons with narrow leaves and parallel veins. Most are herbaceous perennials, though many are evergreen and some develop woody tissues. Ornamental grasses are popular in many countries, they bring striking linear form, color and sound to the garden, throughout the year. Ornamental grasses are popular in many colder hardiness zones for their resilience to cold temperatures and aesthetic value throughout fall and winter seasons. For plants to be considered ornamental, they require specific pruning by a gardener. For instance, many plants cultivated for topiary and bonsai would only be considered to be ornamental by virtue of the regular pruning carried out on them by the gardener, they may cease to be ornamental if the work was abandoned. Ornamental plants and trees are distinguished from utilitarian and crop plants, such as those used for agriculture and vegetable crops, for forestry or as fruit trees.
This does not preclude any particular type of plant being grown both for ornamental qualities in the garden, for utilitarian purposes in other settings. Thus lavender is grown as an ornamental plant in gardens, but may be grown as a crop plant for the production of lavender oil; the term ornamental plant is used here in the same sense that it is used in the horticultural trades. The term corresponds to'garden plant', though the latter is much less precise, as any plant may be grown in a garden. Ornamental plants are plants, rather than functional ones. While some plants are both ornamental and functional, people use the term “ornamental plants” to refer to plants which have no value beyond being attractive, although many people feel that this is value enough. Ornamental plants are the keystone of ornamental gardening, they come in a range of shapes and colors suitable to a broad array of climates and gardening needs; some ornamental plants are grown for showy foliage. Their foliage may be deciduous, turning bright orange and yellow before dropping off in the fall, or evergreen, in which case it stays green year-round.
Some ornamental foliage has a striking appearance created by lacy leaves or long needles, while other ornamentals are grown for distinctively colored leaves, such as silvery-gray ground covers and bright red grasses, among many others. 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. Depending on the types of plants being grown, the flowers may be subtle and delicate, or large and showy, with some ornamental plants producing distinctive aromas which paint a palette of scents in addition to colors. Media related to Ornamental plants at Wikimedia Commons
Supplementum Plantarum Systematis Vegetabilium Editionis Decimae Tertiae, Generum Plantarum Editiones Sextae, et Specierum Plantarum Editionis Secundae abbreviated to Supplementum Plantarum Systematis Vegetabilium or just Supplementum Plantarum, further abbreviated by botanists to Suppl. Pl. is a 1782 book by Carolus Linnaeus the Younger. Written in Latin, it was intended as a supplement to the 1737 Genera Plantarum and the 1753 Species Plantarum, both written by the author's father, the "father of modern taxonomy", Carl Linnaeus, its full title means: “Supplement of Plants, the 13th edition of A System of Vegetables, the 6th edition of The Genera of Plants and the 2nd edition of The Species of Plants”, listing the components of the book in order of presentation. The Systematis Vegetabilium in the title refers to Systema Naturæ as published in 1774 by Johan Andreas Murray, a student of Linnaeus, Sr; the cover page indicates that it was published in 1781, it was long believed to have been published in October of that year.
In 1976, Hermann Manitz used a letter written by Jakob Friedrich Ehrhart to show that it had in fact been published in April 1782. Furthermore, the cover page states that the book was printed in Brunswick, Lower Saxony, northwestern Germany by the printshop Orphanotropheum; the book has 467 pages. The work was translated by Erasmus Darwin's Lichfield Botanical Society as A System of Vegetables, it leaves the binomial nomenclature untranslated in the original Latin, but uses English in the keys and descriptions. Latin Wikisource has original text related to this article: Supplementum Plantarum Black-and-white scan of the book: Digitized from a copy at the University of Lausanne. Suppl. Pl. at the International Plant Names Index Supplementum Plantarum at: botanicus