A greenhouse is a structure with walls and roof made chiefly of transparent material, such as glass, in which plants requiring regulated climatic conditions are grown. These structures range in size from small sheds to industrial-sized buildings. A miniature greenhouse is known as a cold frame; the interior of a greenhouse exposed to sunlight becomes warmer than the external ambient temperature, protecting its contents in cold weather. Many commercial glass greenhouses or hothouses are high tech production facilities for vegetables or flowers; the glass greenhouses are filled with equipment including screening installations, cooling and may be controlled by a computer to optimize conditions for plant growth. Different techniques are used to evaluate optimality-degrees and comfort ratio of greenhouse micro-climate in order to reduce production risk prior to cultivation of a specific crop; the idea of growing plants in environmentally controlled areas has existed since Roman times. The Roman emperor Tiberius ate a cucumber-like vegetable daily.
The Roman gardeners used artificial methods of growing to have it available for his table every day of the year. Cucumbers were planted in wheeled carts which were put in the sun daily taken inside to keep them warm at night; the cucumbers were stored under frames or in cucumber houses glazed with either oiled cloth known as specularia or with sheets of selenite, according to the description by Pliny the Elder. The first description of a heated greenhouse is from the Sanga Yorok, a treatise on husbandry compiled by a royal physician of the Joseon dynasty of Korea during the 1450s, in its chapter on cultivating vegetables during winter; the treatise contains detailed instructions on constructing a greenhouse, capable of cultivating vegetables, forcing flowers, ripening fruit within an artificially heated environment, by utilizing ondol, the traditional Korean underfloor heating system, to maintain heat and humidity. The Annals of the Joseon Dynasty confirm that greenhouse-like structures incorporating ondol were constructed to provide heat for mandarin orange trees during the winter of 1438.
The concept of greenhouses appeared in the Netherlands and England in the 17th century, along with the plants. Some of these early attempts required enormous amounts of work to winterize. There were serious problems with providing balanced heat in these early greenhouses; the first'stove' greenhouse in the UK was completed at Chelsea Physic Garden by 1681. Today, the Netherlands has many of the largest greenhouses in the world, some of them so vast that they are able to produce millions of vegetables every year; the French botanist Charles Lucien Bonaparte is credited with building the first practical modern greenhouse in Leiden, during the 1800s to grow medicinal tropical plants. Only on the estates of the rich, the growth of the science of botany caused greenhouses to spread to the universities; the French called their first greenhouses orangeries, since they were used to protect orange trees from freezing. As pineapples became popular, pineries, or pineapple pits, were built. Experimentation with the design of greenhouses continued during the 17th century in Europe, as technology produced better glass and construction techniques improved.
The greenhouse at the Palace of Versailles was an example of their size and elaborateness. The golden era of the greenhouse was in England during the Victorian era, where the largest glasshouses yet conceived were constructed, as the wealthy upper class and aspiring botanists competed to build the most elaborate buildings. A good example of this trend is the pioneering Kew Gardens. Joseph Paxton, who had experimented with glass and iron in the creation of large greenhouses as the head gardener at Chatsworth, in Derbyshire, working for the Duke of Devonshire and built The Crystal Palace in London. Other large greenhouses built in the 19th century included the New York Crystal Palace, Munich’s Glaspalast and the Royal Greenhouses of Laeken for King Leopold II of Belgium. In Japan, the first greenhouse was built in 1880 by Samuel Cocking, a British merchant who exported herbs. In the 20th century, the geodesic dome was added to the many types of greenhouses. Notable examples are the Eden Project, in Cornwall, The Rodale Institute in Pennsylvania, the Climatron at the Missouri Botanical Garden in St. Louis and Toyota Motor Manufacturing Kentucky.
Greenhouse structures adapted in the 1960s when wider sheets of polyethylene film became available. Hoop houses were made by several companies and were frequently made by the growers themselves. Constructed of aluminum extrusions, special galvanized steel tubing, or just lengths of steel or PVC water pipe, construction costs were reduced; this resulted in many more greenhouses being constructed on garden centers. Polyethylene film durability increased when more effective UV-inhibitors were developed and added in the 1970s. Gutter-connected greenhouses became more prevalent in the 1990s; these greenhouses have
The United States of America known as the United States or America, is a country composed of 50 states, a federal district, five major self-governing territories, various possessions. At 3.8 million square miles, the United States is the world's third or fourth largest country by total area and is smaller than the entire continent of Europe's 3.9 million square miles. With a population of over 327 million people, the U. S. is the third most populous country. The capital is Washington, D. C. and the largest city by population is New York City. Forty-eight states and the capital's federal district are contiguous in North America between Canada and Mexico; the State of Alaska is in the northwest corner of North America, bordered by Canada to the east and across the Bering Strait from Russia to the west. The State of Hawaii is an archipelago in the mid-Pacific Ocean; the U. S. territories are scattered about the Pacific Ocean and the Caribbean Sea, stretching across nine official time zones. The diverse geography and wildlife of the United States make it one of the world's 17 megadiverse countries.
Paleo-Indians migrated from Siberia to the North American mainland at least 12,000 years ago. European colonization began in the 16th century; the United States emerged from the thirteen British colonies established along the East Coast. Numerous disputes between Great Britain and the colonies following the French and Indian War led to the American Revolution, which began in 1775, the subsequent Declaration of Independence in 1776; the war ended in 1783 with the United States becoming the first country to gain independence from a European power. The current constitution was adopted in 1788, with the first ten amendments, collectively named the Bill of Rights, being ratified in 1791 to guarantee many fundamental civil liberties; the United States embarked on a vigorous expansion across North America throughout the 19th century, acquiring new territories, displacing Native American tribes, admitting new states until it spanned the continent by 1848. During the second half of the 19th century, the Civil War led to the abolition of slavery.
By the end of the century, the United States had extended into the Pacific Ocean, its economy, driven in large part by the Industrial Revolution, began to soar. The Spanish–American War and World War I confirmed the country's status as a global military power; the United States emerged from World War II as a global superpower, the first country to develop nuclear weapons, the only country to use them in warfare, a permanent member of the United Nations Security Council. Sweeping civil rights legislation, notably the Civil Rights Act of 1964, the Voting Rights Act of 1965 and the Fair Housing Act of 1968, outlawed discrimination based on race or color. During the Cold War, the United States and the Soviet Union competed in the Space Race, culminating with the 1969 U. S. Moon landing; the end of the Cold War and the collapse of the Soviet Union in 1991 left the United States as the world's sole superpower. The United States is the world's oldest surviving federation, it is a representative democracy.
The United States is a founding member of the United Nations, World Bank, International Monetary Fund, Organization of American States, other international organizations. The United States is a developed country, with the world's largest economy by nominal GDP and second-largest economy by PPP, accounting for a quarter of global GDP; the U. S. economy is post-industrial, characterized by the dominance of services and knowledge-based activities, although the manufacturing sector remains the second-largest in the world. The United States is the world's largest importer and the second largest exporter of goods, by value. Although its population is only 4.3% of the world total, the U. S. holds 31% of the total wealth in the world, the largest share of global wealth concentrated in a single country. Despite wide income and wealth disparities, the United States continues to rank high in measures of socioeconomic performance, including average wage, human development, per capita GDP, worker productivity.
The United States is the foremost military power in the world, making up a third of global military spending, is a leading political and scientific force internationally. In 1507, the German cartographer Martin Waldseemüller produced a world map on which he named the lands of the Western Hemisphere America in honor of the Italian explorer and cartographer Amerigo Vespucci; the first documentary evidence of the phrase "United States of America" is from a letter dated January 2, 1776, written by Stephen Moylan, Esq. to George Washington's aide-de-camp and Muster-Master General of the Continental Army, Lt. Col. Joseph Reed. Moylan expressed his wish to go "with full and ample powers from the United States of America to Spain" to seek assistance in the revolutionary war effort; the first known publication of the phrase "United States of America" was in an anonymous essay in The Virginia Gazette newspaper in Williamsburg, Virginia, on April 6, 1776. The second draft of the Articles of Confederation, prepared by John Dickinson and completed by June 17, 1776, at the latest, declared "The name of this Confederation shall be the'United States of America'".
The final version of the Articles sent to the states for ratification in late 1777 contains the sentence "The Stile of this Confederacy shall be'The United States of America'". In June 1776, Thomas Jefferson wrote the phrase "UNITED STATES OF AMERICA" in all capitalized letters in the headline of his "original Rough draught" of the Declaration of Independence; this draft of the document did not surface unti
A conservatory is a building or room having glass or tarpaulin roofing and walls used as a greenhouse or a sunroom. If in a residence, it would be attached to the house on only one side. Conservatories originated in the 16th century when wealthy landowners sought to cultivate citrus fruits such as lemons and oranges that began to appear on their dinner tables brought by traders from warmer regions of the Mediterranean. Municipal conservatories became popular in the early 19th century. Many cities those in cold climates and with large European populations, have built municipal conservatories to display tropical plants and hold flower displays; this type of conservatory was popular in the early nineteenth century, by the end of the century people were giving them a social use. Conservatory architecture varies from typical Victorian glasshouses to modern styles, such as geodesic domes. Many are included in the list below. In the UK the legal definition of a conservatory is a building that has at least 50% of its side wall area glazed and at least 75% of its roof glazed with translucent materials, either polycarbonate sheeting or glass.
Today, the terms sunroom and conservatory are used interchangeably by the public, but in general the term conservatory and English conservatory evoke the image of an ornate structure, echoing the traditions of that Victorian era of conservatory building. Modern conservatories tend to be graced with a traditional cresting and finial, along with single, double patio or bi-folding doors; these beautiful structures have been designed and built around the world, in private gardens and botanical institutions. Smaller garden conservatories have become popular, which may be dual-function devoted to horticulture and recreation, or favor the latter, as a solarium or sunroom. Preservation of citrus and other tender plants started out as crudely as building a pergola over potted plants or beds or moving potted plants indoors for the cold season. Known in Italy as limonaia, these early structures employed wood panels in storerooms or open galleries to protect from the cold. Further north in Europe, the preservation of orange trees became the trend with special-purpose buildings built to protect the tasty, but delicate fruit.
Orangeries, as they came to be called were enclosed structures built with wood, brick or stone with tall vertical windows on the south walls. Use of these rooms expanded and being used to entertain and to host a wider variety of plants; the term greenhouse came to describe the conservatories for tender plants. In the 18th century a Dutch scientist pioneered the use of sloping glass to bring in more light for the plants than the tall, glass side walls of orangeries; the 19th century was the golden age of conservatory building in England. English conservatories were the product of English love of gardening and new technology in glass and heating technology. Many of the magnificent public conservatories, built of iron and glass, are the result of this era. Kew Gardens in London is an example of a large greenhouse used for growing tender and rare plants, or, less for birds and rare animals – sometimes with the plants and animals living together. Other examples include the Great Palm House at Kew Gardens, built in 1844, built by Decimus Burton and the Crystal Palace, built for London's Great Exhibition of 1851 by Sir Joseph Paxton.
The widespread construction of UK conservatories came to a halt with the onset of World War II. While the advent of insulated glass in the 1950s and 1960s saw the development of simple sunroom structures, it was not until the 1970s that creative architects and builders began to recreate the Victorian styling of 19th-century English conservatories in smaller domestic versions using insulated glass. In contemporary construction, a conservatory differs from an orangery in having more than 75% of its roof surface made from glass. Frame and roof materials include PVCu and timber. A conservatory by definition must have more than 50% of its wall surface glazed. Contemporary conservatories use a number of technologies to ensure glass is as energy efficient as possible, ensuring it lets in the maximum light possible while maintaining a steady temperature throughout summer and winter. Technologies include argon-impregnated glass, easy clean coatings, heat reflective film, thermal ribbons or thermal breaks – hollow sections of glass that intercept heat.
The latest glass technologies involve self-tinting glass that darkens as heat builds up during a summer's day and lightens as the surface temperature of the glass cools in the day. Ballarat Botanical Gardens Bicentennial Conservatory at Adelaide's Botanic Gardens Fitzroy Gardens, Melbourne Royal Greenhouses of Laeken Muttart Conservatory Bloedel Floral Conservatory Allan Gardens Centennial Park Conservatory Assiniboine Park Conservatory Beijing Botanical Garden Shanghai Botanical Garden South China Botanical Garden Copenhagen Botanical Gardens Botanical Gardens and Botanical Museum, Berlin Kew Gardens Chatsworth House Eden Project Syon House Barbican Conservatory Anthaeum, Hove: built in 1830 with the world's largest dome, it collapsed on its opening day in 1833. Belfast Botanic Gardens Royal Botanic Garden, Edinburgh Kibble Palace The Tollcross Winter Gardens, Glasgow Pearson Conservatory, Port Elizabeth The Botanical Society Conservatory, Kirstenbosch National Botanical Garden, Cape Town Anna Scripps Whitcomb Conservatory Biosphe
Oregon is a state in the Pacific Northwest region on the West Coast of the United States. The Columbia River delineates much of Oregon's northern boundary with Washington, while the Snake River delineates much of its eastern boundary with Idaho; the parallel 42 ° north delineates the southern boundary with Nevada. Oregon is one of only four states of the continental United States to have a coastline on the Pacific Ocean. Oregon was inhabited by many indigenous tribes before Western traders and settlers arrived. An autonomous government was formed in the Oregon Country in 1843 before the Oregon Territory was created in 1848. Oregon became the 33rd state on February 14, 1859. Today, at 98,000 square miles, Oregon is the ninth largest and, with a population of 4 million, 27th most populous U. S. state. The capital, Salem, is the second most populous city in Oregon, with 169,798 residents. Portland, with 647,805, ranks as the 26th among U. S. cities. The Portland metropolitan area, which includes the city of Vancouver, Washington, to the north, ranks the 25th largest metro area in the nation, with a population of 2,453,168.
Oregon is one of the most geographically diverse states in the U. S. marked by volcanoes, abundant bodies of water, dense evergreen and mixed forests, as well as high deserts and semi-arid shrublands. At 11,249 feet, Mount Hood, a stratovolcano, is the state's highest point. Oregon's only national park, Crater Lake National Park, comprises the caldera surrounding Crater Lake, the deepest lake in the United States; the state is home to the single largest organism in the world, Armillaria ostoyae, a fungus that runs beneath 2,200 acres of the Malheur National Forest. Because of its diverse landscapes and waterways, Oregon's economy is powered by various forms of agriculture and hydroelectric power. Oregon is the top timber producer of the contiguous United States, the timber industry dominated the state's economy in the 20th century. Technology is another one of Oregon's major economic forces, beginning in the 1970s with the establishment of the Silicon Forest and the expansion of Tektronix and Intel.
Sportswear company Nike, Inc. headquartered in Beaverton, is the state's largest public corporation with an annual revenue of $30.6 billion. The earliest evidence of the name Oregon has Spanish origins; the term "orejón" comes from the historical chronicle Relación de la Alta y Baja California written by the new Spaniard Rodrigo Montezuma and made reference to the Columbia River when the Spanish explorers penetrated into the actual North American territory that became part of the Viceroyalty of New Spain. This chronicle is the first topographical and linguistic source with respect to the place name Oregon. There are two other sources with Spanish origins, such as the name Oregano, which grows in the southern part of the region, it is most probable that the American territory was named by the Spaniards, as there are some populations in Spain such as "Arroyo del Oregón" considering that the individualization in Spanish language "El Orejón" with the mutation of the letter "g" instead of "j". Another early use of the name, spelled Ouragon, was in a 1765 petition by Major Robert Rogers to the Kingdom of Great Britain.
The term referred to the then-mythical River of the West. By 1778, the spelling had shifted to Oregon. In his 1765 petition, Rogers wrote: The rout...is from the Great Lakes towards the Head of the Mississippi, from thence to the River called by the Indians Ouragon... One theory is that the name comes from the French word ouragan, applied to the River of the West based on Native American tales of powerful Chinook winds on the lower Columbia River, or from firsthand French experience with the Chinook winds of the Great Plains. At the time, the River of the West was thought to rise in western Minnesota and flow west through the Great Plains. Joaquin Miller explained in Sunset magazine, in 1904, how Oregon's name was derived: The name, Oregon, is rounded down phonetically, from Ouve água—Oragua, Or-a-gon, Oregon—given by the same Portuguese navigator that named the Farallones after his first officer, it in a large way, means cascades:'Hear the waters.' You should steam up the Columbia and hear and feel the waters falling out of the clouds of Mount Hood to understand the full meaning of the name Ouve a água, Oregon.
Another account, endorsed as the "most plausible explanation" in the book Oregon Geographic Names, was advanced by George R. Stewart in a 1944 article in American Speech. According to Stewart, the name came from an engraver's error in a French map published in the early 18th century, on which the Ouisiconsink River was spelled "Ouaricon-sint", broken on two lines with the -sint below, so there appeared to be a river flowing to the west named "Ouaricon". According to the Oregon Tourism Commission, present-day Oregonians pronounce the state's name as "or-uh-gun, never or-ee-gone". After being drafted by the Detroit Lions in 2002, former Oregon Ducks quarterback Joey Harrington distributed "Orygun" stickers to members of the media as a reminder of how to pronounce the name of his home state; the stickers are sold by the University of Oregon Bookstore. Oregon is 295 miles north to south at longest distance, 395 miles east to west. With an area of 98,381 square miles, Oregon is larger than the United Kingdom.
It is the ninth largest state in the United States. Oregon's highest point is the summit of Mount Hood, at 11,249 feet, its lowest point is the sea level of the Pacific Ocean along the Oregon Coas
Skateboarding is an action sport which involves riding and performing tricks using a skateboard, as well as a recreational activity, an art form, an entertainment industry job, a method of transportation. Skateboarding has been influenced by many skateboarders throughout the years. A 2009 report found that the skateboarding market is worth an estimated $4.8 billion in annual revenue with 11.08 million active skateboarders in the world. In 2016, it was announced that skateboarding will be represented at the 2020 Summer Olympics in Tokyo. Since the 1970s, skateparks have been constructed for use by skateboarders, Freestyle BMXers, aggressive skaters, recently, scooters. However, skateboarding has become controversial in areas in which the activity, although illegal, has damaged curbs, steps, benches and parks; the first skateboards started with wooden boxes, or boards, with roller skate wheels attached to the bottom. Crate scooters preceded skateboards, having a wooden crate attached to the nose, which formed rudimentary handlebars.
The boxes turned into planks, similar to the skateboard decks of today. Skateboarding, as we know it, was born sometime in the late 1940s, or early 1950s, when surfers in California wanted something to do when the waves were flat; this was called "sidewalk surfing" – a new wave of surfing on the sidewalk as the sport of surfing became popular. No one knows; the first manufactured skateboards were ordered by a Los Angeles, California surf shop, meant to be used by surfers in their downtime. The shop owner, Bill Richard, made a deal with the Chicago Roller Skate Company to produce sets of skate wheels, which they attached to square wooden boards. Accordingly, skateboarding was denoted "sidewalk surfing" and early skaters emulated surfing style and maneuvers, performed barefoot. By the 1960s a small number of surfing manufacturers in Southern California such as Jack's, Kips', Bing's and Makaha started building skateboards that resembled small surfboards, assembled teams to promote their products.
One of the earliest Skateboard exhibitions was sponsored by Makaha's founder, Larry Stevenson, in 1963 and held at the Pier Avenue Junior High School in Hermosa Beach, California. Some of these same teams of skateboarders were featured on a television show called "Surf's Up" in 1964, hosted by Stan Richards, that helped promote skateboarding as something new and fun to do; as the popularity of skateboarding began expanding, the first skateboarding magazine, The Quarterly Skateboarder was published in 1964. John Severson, who published the magazine, wrote in his first editorial: Today's skateboarders are founders in this sport—they're pioneers—they are the first. There is no history in Skateboarding—its being made now—by you; the sport is being molded and we believe that doing the right thing now will lead to a bright future for the sport. There are storm clouds on the horizon with opponents of the sport talking about ban and restriction; the magazine only lasted four issues, but resumed publication as Skateboarder in 1975.
The first broadcast of an actual skateboarding competition was the 1965 National Skateboarding Championships, which were held in Anaheim and aired on ABC's Wide World of Sports. Because skateboarding was a new sport during this time, there were only two original disciplines during competitions: flatland freestyle and slalom downhill racing. One of the earliest sponsored skateboarders, Patti McGee, was paid by Hobie and Vita Pak to travel around the country to do skateboarding exhibitions and to demonstrate skateboarding safety tips. McGee made the cover of Life magazine in 1965 and was featured on several popular television programs—The Mike Douglas Show, What's My Line? and The Tonight Show Starring Johnny Carson—which helped make skateboarding more popular at the time. Some other well known surfer-style skateboarders of the time were Danny Bearer, Torger Johnson, Bruce Logan and Mark Richards, Woody Woodward, & Jim Fitzpatrick; the growth of the sport during this period can be seen in sales figures for Makaha, which quoted $10 million worth of board sales between 1963 and 1965.
By 1966 a variety of sources began to claim that skateboarding was dangerous, resulting in shops being reluctant to sell them, parents being reluctant to buy them. In 1966 sales had dropped and Skateboarder Magazine had stopped publication; the popularity of skateboarding remained low until the early 1970s. In the early 1970s, Frank Nasworthy started to develop a skateboard wheel made of polyurethane, calling his company Cadillac Wheels. Prior to this new material, skateboards wheels were "clay" wheels; the improvement in traction and performance was so immense that from the wheel's release in 1972 the popularity of skateboarding started to rise again, causing companies to invest more in product development. Nasworthy commissioned artist Jim Evans to do a series of paintings promoting Cadillac Wheels, they were featured as ads and posters in the resurrected Skateboarder magazine, proved immensely popular in promoting the new style of skateboarding. In the early 1970s skateparks hadn't been invented yet, so skateboarders would flock and skateboard in such urban places as The Escondido reservoir in San Diego, California.
Skateboarding magazine would publish the location and Skateboarders made up nicknames for each location such as the Tea Bowl, the Fruit Bowl, the Rabbit Hole, Bird Bath, the Egg Bowl, Upland Pool and the Sewer Slide. Some of the development concepts in the terrain of skateparks were taken from the Escondido re
A rose is a woody perennial flowering plant of the genus Rosa, in the family Rosaceae, or the flower it bears. There are over thousands of cultivars, they form a group of plants that can be erect shrubs, climbing, or trailing, with stems that are armed with sharp prickles. Flowers vary in size and shape and are large and showy, in colours ranging from white through yellows and reds. Most species are native to Asia, with smaller numbers native to Europe, North America, northwestern Africa. Species and hybrids are all grown for their beauty and are fragrant. Roses have acquired cultural significance in many societies. Rose plants range in size from compact, miniature roses, to climbers that can reach seven meters in height. Different species hybridize and this has been used in the development of the wide range of garden roses; the name rose comes from French, itself from Latin rosa, borrowed from Oscan, from Greek ρόδον rhódon, itself borrowed from Old Persian wrd-, related to Avestan varəδa, Sogdian ward, Parthian wâr.
The leaves are borne alternately on the stem. In most species they are 5 to 15 centimetres long, with 5–9 leaflets and basal stipules. Most roses are deciduous but a few are evergreen or nearly so; the flowers of most species have five petals, with the exception of Rosa sericea, which has only four. Each petal is divided into two distinct lobes and is white or pink, though in a few species yellow or red. Beneath the petals are five sepals; these may be long enough to be visible when viewed from above and appear as green points alternating with the rounded petals. There are multiple superior ovaries. Roses are insect-pollinated in nature; the aggregate fruit of the rose is a berry-like structure. Many of the domestic cultivars do not produce hips, as the flowers are so petalled that they do not provide access for pollination; the hips of most species are red. Each hip comprises an outer fleshy layer, the hypanthium, which contains 5–160 "seeds" embedded in a matrix of fine, but stiff, hairs. Rose hips of some species the dog rose and rugosa rose, are rich in vitamin C, among the richest sources of any plant.
The hips are eaten by fruit-eating birds such as thrushes and waxwings, which disperse the seeds in their droppings. Some birds finches eat the seeds; the sharp growths along a rose stem, though called "thorns", are technically prickles, outgrowths of the epidermis, unlike true thorns, which are modified stems. Rose prickles are sickle-shaped hooks, which aid the rose in hanging onto other vegetation when growing over it; some species such as Rosa rugosa and Rosa pimpinellifolia have densely packed straight prickles an adaptation to reduce browsing by animals, but possibly an adaptation to trap wind-blown sand and so reduce erosion and protect their roots. Despite the presence of prickles, roses are browsed by deer. A few species of roses have only vestigial prickles; the genus Rosa is subdivided into four subgenera: Hulthemia containing two species from southwest Asia, Rosa persica and Rosa berberifolia, which are the only roses without compound leaves or stipules. Hesperrhodos contains Rosa stellata, from North America.
Platyrhodon with one species from east Asia, Rosa roxburghii. Rosa containing all the other roses; this subgenus is subdivided into 11 sections. Banksianae – white and yellow flowered roses from China. Bracteatae – three species, two from China and one from India. Caninae – pink and white flowered species from Asia and North Africa. Carolinae – white and bright pink flowered species all from North America. Chinensis – white, yellow and mixed-color roses from China and Burma. Gallicanae – pink to crimson and striped flowered roses from western Asia and Europe. Gymnocarpae – one species in western North America, others in east Asia. Laevigatae – a single white flowered species from China. Pimpinellifoliae – white, bright yellow and striped roses from Asia and Europe. Rosa – white, lilac and red roses from everywhere but North Africa. Synstylae – white and crimson flowered roses from all areas. Roses are best known as ornamental plants grown for their flowers in the garden and sometimes indoors, they have been used for commercial perfumery and commercial cut flower crops.
Some are used as landscape plants, for hedging and for other utilitarian purposes such as game cover and slope stabilization. The majority of ornamental roses are hybrids. A few species roses are grown for attractive or scented foliage, ornamental thorns or for their showy fruit. Ornamental roses have been cultivated for millennia, with the earliest known cultivation known to date from at least 500 BC in Mediterranean countries, P
The Mississippi River is the second-longest river and chief river of the second-largest drainage system on the North American continent, second only to the Hudson Bay drainage system. Its source is Lake Itasca in northern Minnesota and it flows south for 2,320 miles to the Mississippi River Delta in the Gulf of Mexico. With its many tributaries, the Mississippi's watershed drains all or parts of 32 U. S. two Canadian provinces between the Rocky and Appalachian mountains. The main stem is within the United States; the Mississippi ranks as the fifteenth-largest river by discharge in the world. The river either borders or passes through the states of Minnesota, Iowa, Missouri, Tennessee, Arkansas and Louisiana. Native Americans have lived along its tributaries for thousands of years. Most were hunter-gatherers, but some, such as the Mound Builders, formed prolific agricultural societies; the arrival of Europeans in the 16th century changed the native way of life as first explorers settlers, ventured into the basin in increasing numbers.
The river served first as a barrier, forming borders for New Spain, New France, the early United States, as a vital transportation artery and communications link. In the 19th century, during the height of the ideology of manifest destiny, the Mississippi and several western tributaries, most notably the Missouri, formed pathways for the western expansion of the United States. Formed from thick layers of the river's silt deposits, the Mississippi embayment is one of the most fertile regions of the United States. During the American Civil War, the Mississippi's capture by Union forces marked a turning point towards victory, due to the river's strategic importance to the Confederate war effort; because of substantial growth of cities and the larger ships and barges that replaced steamboats, the first decades of the 20th century saw the construction of massive engineering works such as levees and dams built in combination. A major focus of this work has been to prevent the lower Mississippi from shifting into the channel of the Atchafalaya River and bypassing New Orleans.
Since the 20th century, the Mississippi River has experienced major pollution and environmental problems – most notably elevated nutrient and chemical levels from agricultural runoff, the primary contributor to the Gulf of Mexico dead zone. The word Mississippi itself comes from Misi zipi, the French rendering of the Anishinaabe name for the river, Misi-ziibi. In the 18th century, the river was the primary western boundary of the young United States, since the country's expansion westward, the Mississippi River has been considered a convenient if approximate dividing line between the Eastern and Midwestern United States, the Western United States; this is exemplified by the Gateway Arch in St. Louis and the phrase "Trans-Mississippi" as used in the name of the Trans-Mississippi Exposition, it is common to qualify a regionally superlative landmark in relation to it, such as "the highest peak east of the Mississippi" or "the oldest city west of the Mississippi". The FCC uses it as the dividing line for broadcast call-signs, which begin with W to the east and K to the west, mixing together in media markets along the river.
The Mississippi River can be divided into three sections: the Upper Mississippi, the river from its headwaters to the confluence with the Missouri River. The Upper Mississippi runs from its headwaters to its confluence with the Missouri River at St. Louis, Missouri, it is divided into two sections: The headwaters, 493 miles from the source to Saint Anthony Falls in Minneapolis, Minnesota. The source of the Upper Mississippi branch is traditionally accepted as Lake Itasca, 1,475 feet above sea level in Itasca State Park in Clearwater County, Minnesota; the name "Itasca" was chosen to designate the "true head" of the Mississippi River as a combination of the last four letters of the Latin word for truth and the first two letters of the Latin word for head. However, the lake is in turn fed by a number of smaller streams. From its origin at Lake Itasca to St. Louis, the waterway's flow is moderated by 43 dams. Fourteen of these dams are located above Minneapolis in the headwaters region and serve multiple purposes, including power generation and recreation.
The remaining 29 dams, beginning in downtown Minneapolis, all contain locks and were constructed to improve commercial navigation of the upper river. Taken as a whole, these 43 dams shape the geography and influence the ecology of the upper river. Beginning just below Saint Paul and continuing throughout the upper and lower river, the Mississippi is further controlled by thousands of wing dikes that moderate the river's flow in order to maintain an open navigation channel and prevent the river from eroding its banks; the head of navigation on the Mississippi is the Coon Rapids Dam in Minnesota. Before it was built in 1913, steamboats could go upstream as far as Saint Cloud, depending on river conditions; the uppermost lock and dam on the Upper Mississippi River is the Upper St. Anthony Falls Lock an