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Peridiscaceae
Peridiscaceae is a Family (biology), family of flowering plants in the Order (biology), order Saxifragales.Peter F. Stevens. 2001 onwards. "Peridiscaceae". At: Angiosperm Phylogeny Website At: Missouri Botanical Garden Website. (see ''External links'' below). Four genera comprise this family: ''Medusandra, Soyauxia, Peridiscus'', and ''Whittonia''.,Kenneth J. Wurdack and Charles C. Davis. 2009. "Malpighiales phylogenetics: Gaining ground on one of the most recalcitrant clades in the angiosperm tree of life." ''American Journal of Botany'' 96(8):1551-1570. with a total of 12 known species. It has a disjunct distribution, with ''Peridiscus'' occurring in Venezuela and northern Brazil, ''Whittonia'' in Guyana,Clemens Bayer. 2007. "Peridiscaceae" pages 297-300. In: Klaus Kubitski (editor). ''The Families and Genera of Vascular Plants'' volume IX. Springer-Verlag: Berlin;Heidelberg, Germany. ''Medusandra'' in Cameroon, and ''Soyauxia'' in Tropics, tropical West Africa.Vernon H. Heywoo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saxifragales
Saxifragales is an order (biology), order of flowering plants in the Superrosids, superrosid clade of the eudicots. It contains 15 Families (biology), families and around 100 genera, with nearly 2,500 species. Well-known and economically important members of this order include Saxifraga, saxifrages (after whom the order is named), blackcurrants, redcurrants, Gooseberry, gooseberries, Peony, peonies, liquidambars, witch-hazel, Parrotia persica, Persian ironwood, Cercidiphyllum, katsura, Crassula ovata, jade plant, Sempervivum, houseleeks, and Myriophyllum, water milfoil. Of the 15 families, many are small, with eight of them being Monotypic taxon, monotypic (having only a single genus). The largest family is the Crassulaceae (stonecrops), a diverse group of mostly Succulent plant, succulent plants, with about 35 genera. Saxifragales are found worldwide, primarily in Temperate climate, temperate to Subtropics, subtropical zones, rarely being encountered growing wild in the tropi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soyauxia
''Soyauxia'' is a genus of flowering plants in the family Peridiscaceae.Clemens Bayer. 2007. "Peridiscaceae" pages 297-300. In: Klaus Kubitski (editor). ''The Families and Genera of Vascular Plants'' volume IX. Springer-Verlag: Berlin;Heidelberg, Germany. They are small trees or erect shrubs from wet forests of tropical West Africa. Eight specific names have been published in ''Soyauxia''."Soyauxia" At: International Plant Names Index. (see ''External links'' below). Additional species have been discovered, but their names and descriptions will not be published until 2009 or 2010. The type species for the genus is '' Soyauxia gabonensis''.''Soyauxia'' In: Index Nominum Genericorum. In: Regnum Vegetabile (see ''External links'' below). ''Soyauxia'' was long considered an anomaly and it has been variously classified by different authors, usually in Passifloraceae or in the defunct plant family Flacourtiaceae. The first molecular phylogenetic study to include ''Soyauxia' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Medusandra
''Medusandra'' is a genus of flowering plants in the family Peridiscaceae."Peridiscaceae" At: Peter F. Stevens (2001 onwards). Angiosperm Phylogeny Website. At: Missouri Botanical Garden Website. (see external links below) It has two species, '' Medusandra richardsiana'' and '' Medusandra mpomiana''."Medusandra" At: International Plant Names Index. (see ''External links'' below). ''M. richardsiana'' is the most common and well known. Both species are native to Cameroon and adjacent countries.Vernon H. Heywood, Richard K. Brummitt, Ole Seberg, and Alastair Culham. ''Flowering Plant Families of the World''. Firefly Books: Ontario, Canada. (2007). ''Medusandra'' was named by John Brenan in 1952.John P.M. Brenan. 1952. "Plants of the Cambridge Expedition, 1947-1948: II. A new order of flowering plants from the British Cameroons". ''Kew Bulletin'' 7:227-236. Brenan put ''Medusandra'' in its own family, Medusandraceae, and added ''Soyauxia'' to that family in 1953.John P.M. Brenan. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peridiscus
''Peridiscus lucidus'' is a species of flowering plant, the only species in the genus ''Peridiscus'', which is one of four genera within the family Peridiscaceae. It grows in Venezuela and northern Brazil, in evergreen, sometimes riverine forests. It was originally described by Bentham and Hooker in 1862. The taxonomic history of ''Peridiscus'' and of Peridiscaceae is complex, and has been resolved by molecular phylogenetic analysis. Description ''Peridiscus lucidus'' is a tree with glabrous leaves; its flowers grow on elongated racemes. The flowers have pale green to yellow or white sepals (4–6). The stamens are inserted outside the lobulate disc and the ovary is glabrous and partly sunken in the disc. The fruit is subglobose and greenish, with a single seed In botany, a seed is a plant structure containing an embryo and stored nutrients in a protective coat called a ''testa''. More generally, the term "seed" means anything that can be Sowing, sown, which may inc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
João Geraldo Kuhlmann
João Geraldo Kuhlmann (1882 Blumenau, Santa Catarina -1958 Rio de Janeiro, Rio de Janeiro) was a Brazilian botanist. Life Kuhlmann was a specialist on taxonomy of angiosperms. He was a great collector of herborized material (his collection was gathered at a museum - Botanical Museum Kuhlmann, created in 1960, later the Botanical Museum of the Botanical Garden of Rio de Janeiro opened to the public on September 20, 1991, incorporated this collection of the Kuhlmann Museum ) and notable ''connoisseur'' of the Brazilian Flora, influencing a large number of researchers in this area of the knowledge in Brazil, for example William Rodrigues. He published about eighty works, describing new genera (see below), and species. He also erected two families. He put ''Peridiscus'' in a family by itself in 1950. Peridiscaceae has since been expanded to include ''Medusandra'','' Soyauxia'', and '' Whittonia''. He also put '' Duckeodendron'' into its own family, Duckeodendraceae, but this, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Whittonia
''Whittonia'' is a monotypic genus of flowering plants belonging to the family Peridiscaceae. It only contains one known species, ''Whittonia guianensis''. It is native to Guyana. The genus name of ''Whittonia'' is in honour of Brian Alan Whitton (b. 1935), an English botanist at Durham University. The Latin specific epithet of ''guianensis'' means "of the Guianas The Guianas, also spelled Guyanas or Guayanas, are a geographical region in north-eastern South America. Strictly, the term refers to the three Guianas: Guyana, Suriname, and French Guiana, formerly British Guiana, British, Surinam (Dutch colo ..." (an area of north eastern South America). Both the genus and the species were first described and published in Kew Bull. Vol.15 on page 468 (written 1961, publblished in 1962). References {{Taxonbar, from1=Q10393527, from2=Q17780657 Peridiscaceae Monotypic Saxifragales genera Plants described in 1962 Flora of Guyana ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kaieteur Falls
Kaieteur Falls is one of the most powerful single-drop waterfalls in the world. It is located on the Potaro River in Kaieteur National Park, central Essequibo Territory, Guyana. It is 226 metres (741 ft) high when measured from its plunge over a sandstone and conglomerate cliff to the first break. It then flows over a series of steep cascades that, when included in the measurements, bring the total height to 251 metres (822 ft). While many falls have greater height or greater flow, few have the combination of height and water volume, and Kaieteur is among the most powerful waterfalls in the world with an average flow rate of 663 cubic meters per second (23,400 cubic feet per second). Kaieteur Falls is about four and a half times the height of Niagara Falls, on the border between Canada and the United States, and about twice the height of Victoria Falls, on the border of Zambia and Zimbabwe in Africa. Upriver from the falls, the Potaro Plateau stretches out to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
West Africa
West Africa, also known as Western Africa, is the westernmost region of Africa. The United Nations geoscheme for Africa#Western Africa, United Nations defines Western Africa as the 16 countries of Benin, Burkina Faso, Cape Verde, The Gambia, Ghana, Guinea, Guinea-Bissau, Ivory Coast, Liberia, Mali, Mauritania, Niger, Nigeria, Senegal, Sierra Leone, and Togo, as well as Saint Helena, Ascension and Tristan da Cunha (United Kingdom Overseas Territories, United Kingdom Overseas Territory).Paul R. Masson, Catherine Anne Pattillo, "Monetary union in West Africa (ECOWAS): is it desirable and how could it be achieved?" (Introduction). International Monetary Fund, 2001. The population of West Africa is estimated at around million people as of , and at 381,981,000 as of 2017, of which 189,672,000 were female and 192,309,000 male.United Nations Department of Economic and Social Affairs, Population Division (2017). World Population Prospects: The 2017 Revision, custom data acquired via webs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extinct
Extinction is the termination of an organism by the death of its Endling, last member. A taxon may become Functional extinction, functionally extinct before the death of its last member if it loses the capacity to Reproduction, reproduce and recover. As a species' potential Range (biology), range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxon, Lazarus taxa, where a species presumed extinct abruptly "reappears" (typically in the Fossil, fossil record) after a period of apparent absence. Over five billion species are estimated to have died out. It is estimated that there are currently around 8.7 million species of eukaryotes globally, possibly many times more if microorganisms are included. Notable extinct animal species include Dinosaur, non-avian dinosaurs, Machairodontinae, saber-toothed cats, and mammoths. Through evolution, species arise through the process of specia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Biological Specimen
A biological specimen (also called a biospecimen) is a biological laboratory specimen held by a biorepository for research. Such a specimen would be taken by sampling so as to be representative of any other specimen taken from the source of the specimen. When biological specimens are stored, ideally they remain equivalent to freshly-collected specimens for the purposes of research. Human biological specimens are stored in a type of biorepository called a biobank, and the science of preserving biological specimens is most active in the field of biobanking. Quality control Setting broad standards for quality of biological specimens was initially an underdeveloped aspect of biobank growth. There is currently discussion on what standards should be in place and who should manage those standards. Since many organizations set their own standards and since biobanks are necessarily used by multiple organizations and typically are driven towards expansion, the harmonization of standa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Forest
A forest is an ecosystem characterized by a dense ecological community, community of trees. Hundreds of definitions of forest are used throughout the world, incorporating factors such as tree density, tree height, land use, legal standing, and ecological function. The United Nations' Food and Agriculture Organization (FAO) defines a forest as, "Land spanning more than 0.5 hectares with trees higher than 5 meters and a Canopy (biology), canopy cover of more than 10 percent, or trees able to reach these thresholds ''in situ''. It does not include land that is predominantly under agricultural or urban use." Using this definition, ''Global Forest Resources Assessment (FRA), Global Forest Resources Assessment 2020'' found that forests covered , or approximately 31 percent of the world's land area in 2020. Forests are the largest Terrestrial ecosystem, terrestrial ecosystems of Earth by area, and are found around the globe. 45 percent of forest land is in the Tropical forest, trop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tree
In botany, a tree is a perennial plant with an elongated stem, or trunk, usually supporting branches and leaves. In some usages, the definition of a tree may be narrower, e.g., including only woody plants with secondary growth, only plants that are usable as lumber, or only plants above a specified height. But wider definitions include taller palms, tree ferns, bananas, and bamboos. Trees are not a monophyletic taxonomic group but consist of a wide variety of plant species that have independently evolved a trunk and branches as a way to tower above other plants to compete for sunlight. The majority of tree species are angiosperms or hardwoods; of the rest, many are gymnosperms or softwoods. Trees tend to be long-lived, some trees reaching several thousand years old. Trees evolved around 400 million years ago, and it is estimated that there are around three trillion mature trees in the world currently. A tree typically has many secondary branches supported cle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
