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Pseudophyllanthus
''Pseudophyllanthus'' is a monotypic genus of flowering plants in the family Phyllanthaceae. It is one of the eight genera in the tribe Poranthereae. Its closest relative is ''Poranthera''. Its sole species is ''Pseudophyllanthus ovalis''. It is a dioecious, or rarely monoecious, shrub or small tree, native to southern Africa. It had been included in the genus '' Andrachne'', but in 2007 a molecular phylogenetic study of DNA sequence A nucleic acid sequence is a succession of bases within the nucleotides forming alleles within a DNA (using GACT) or RNA (GACU) molecule. This succession is denoted by a series of a set of five different letters that indicate the order of the nu ...s showed that it did not belong there.Maria S. Vorontsova, Petra Hoffmann, Olivier Maurin, and Mark W. Chase. 2007. "Phylogenetics of tribe Poranthereae (Phyllanthaceae)." ''American Journal of Botany'' 94(12):2026-2040. In 2008, the new genus ''Pseudophyllanthus'' was created for it.Maria S. Vorontso ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Andrachne
''Andrachne'' is a genus of flowering plants in the family Phyllanthaceae described by Linnaeus in 1753. It is one of eight genera in the tribe Poranthereae. Maria S. Vorontsova and Petra Hoffmann. 2008. "A phylogenetic classification of tribe Poranthereae (Phyllanthaceae)." ''Kew Bulletin'' 63(1):41-59. They are monoecious herbs or subshrubs, native to semideserts and desert margins of the Americas, southern Europe, North Africa, and South Asia. Linnaeus took the name from Theophrastus, but it is not clear to which plant Theophrastus applied the name.Umberto Quattrocchi. 2000. ''CRC World Dictionary of Plant Names'' volume I, page 135. CRC Press: Boca Raton; New York; Washington, DC;, USA. London, UK. (vol. I) (see ''External links'' below).''Andrachne'' In: Index Nominum Genericorum. In: Regnum Vegetabile (see ''External links'' below). Actually, the etymology of the genus name corresponds to the Ancient Greek word (), meaning either "common purslane" ('' Portulaca oleracea' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Poranthereae
Poranthereae is a tribe in the plant family Phyllanthaceae. It is one of ten tribes in the family, and one of four tribes in the subfamily Phyllanthoideae. Poranthereae comprises about 111 species, distributed into eight genera. The largest genera and the number of species in each are ''Actephila'' (31), ''Meineckia'' (30), and ''Andrachne'' (22). The tribe consists of herbs, shrubs, and small to medium trees. They have a cosmopolitan distribution, occurring on all continents, except Antarctica. The circumscription and classification of Poranthereae were substantially revised following phylogenetic analysis of DNA sequences from members of the family Phyllanthaceae. Within Poranthereae, groups of related genera are strongly correlated with habitat and geographical distribution. For example, ''Notoleptopus'', ''Pseudophyllanthus'', and ''Poranthera'' are restricted to the Old World Southern Hemisphere. Description Monoecious, sometimes dioecious herbs, shrubs, or trees to 6m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phyllanthaceae
Phyllanthaceae is a Family (biology), family of flowering plants in the eudicot Order (biology), order Malpighiales. It is most closely related to the family Picrodendraceae.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. (see ''External links'' below) The Phyllanthaceae are most numerous in the tropics, with many in the Temperateness, south temperate zone, and a few ranging as far north as the middle of the Temperateness, north temperate zone.Petra Hoffman. 2007. "Phyllanthaceae" pages 250-252. In: Vernon H. Heywood, Richard K. Brummitt, Ole Seberg, and Alastair Culham. ''Flowering Plant Families of the World.'' Firefly Books: Ontario, Canada. . Some species of ''Andrachne'', ''Antidesma'', ''Margaritaria'', and ''Phyllanthus'' are in cultivation.Anthony J. Huxley, Mark Griffiths, and Margot Levy (editors). 1992. ''The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Poranthera
''Poranthera'' is a genus of flowering plant belonging to the family Phyllanthaceae first described as a genus in 1811.Rudge, Edward. 1811. Transactions of the Linnean Society of London 10: 302-303 in Latin It is one of eight genera in the Poranthereae.Maria S. Vorontsova and Petra Hoffmann. 2008. "A phylogenetic classification of tribe Poranthereae (Phyllanthaceae)." ''Kew Bulletin'' 63(1):41-59. Its closest relative [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dioecious
Dioecy ( ; ; adj. dioecious, ) is a characteristic of certain species that have distinct unisexual individuals, each producing either male or female gametes, either directly (in animals) or indirectly (in seed plants). Dioecious reproduction is biparental reproduction. Dioecy has costs, since only the female part of the population directly produces offspring. It is one method for excluding self-fertilization and promoting allogamy (outcrossing), and thus tends to reduce the expression of recessive deleterious mutations present in a population. Plants have several other methods of preventing self-fertilization including, for example, dichogamy, herkogamy, and self-incompatibility. In zoology In zoology, dioecy means that an animal is either male or female, in which case the synonym gonochory is more often used. Most animal species are gonochoric, almost all vertebrate species are gonochoric, and all bird and mammal species are gonochoric. Dioecy may also describe colonies ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monotypic Malpighiales Genera
In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispecific" or "monospecific" is sometimes preferred. In botanical nomenclature, a monotypic genus is a genus in the special case where a genus and a single species are simultaneously described. Theoretical implications Monotypic taxa present several important theoretical challenges in biological classification. One key issue is known as "Gregg's Paradox": if a single species is the only member of multiple hierarchical levels (for example, being the only species in its genus, which is the only genus in its family), then each level needs a distinct definition to maintain logical structure. Otherwise, the different taxonomic ranks become effectively identical, which creates problems for organizing biological diversity in a hierarchical system. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DNA Sequence
A nucleic acid sequence is a succession of bases within the nucleotides forming alleles within a DNA (using GACT) or RNA (GACU) molecule. This succession is denoted by a series of a set of five different letters that indicate the order of the nucleotides. By convention, sequences are usually presented from the 5' end to the 3' end. For DNA, with its double helix, there are two possible directions for the notated sequence; of these two, the sense strand is used. Because nucleic acids are normally linear (unbranched) polymers, specifying the sequence is equivalent to defining the covalent structure of the entire molecule. For this reason, the nucleic acid sequence is also termed the primary structure. The sequence represents genetic information. Biological deoxyribonucleic acid represents the information which directs the functions of an organism. Nucleic acids also have a secondary structure and tertiary structure. Primary structure is sometimes mistakenly referred to as "prim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Molecular Phylogenetic
Molecular phylogenetics () is the branch of phylogeny that analyzes genetic, hereditary molecular differences, predominantly in DNA sequences, to gain information on an organism's evolutionary relationships. From these analyses, it is possible to determine the processes by which diversity among species has been achieved. The result of a molecular phylogenetic analysis is expressed in a phylogenetic tree. Molecular phylogenetics is one aspect of molecular systematics, a broader term that also includes the use of molecular data in taxonomy and biogeography. Molecular phylogenetics and molecular evolution correlate. Molecular evolution is the process of selective changes (mutations) at a molecular level (genes, proteins, etc.) throughout various branches in the tree of life (evolution). Molecular phylogenetics makes inferences of the evolutionary relationships that arise due to molecular evolution and results in the construction of a phylogenetic tree. History The theoretical fra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Africa
Africa is the world's second-largest and second-most populous continent after Asia. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth's land area and 6% of its total surface area.Sayre, April Pulley (1999), ''Africa'', Twenty-First Century Books. . With nearly billion people as of , it accounts for about of the world's human population. Demographics of Africa, Africa's population is the youngest among all the continents; the median age in 2012 was 19.7, when the worldwide median age was 30.4. Based on 2024 projections, Africa's population will exceed 3.8 billion people by 2100. Africa is the least wealthy inhabited continent per capita and second-least wealthy by total wealth, ahead of Oceania. Scholars have attributed this to different factors including Geography of Africa, geography, Climate of Africa, climate, corruption, Scramble for Africa, colonialism, the Cold War, and neocolonialism. Despite this lo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Indigenous (ecology)
In biogeography, a native species is indigenous to a given region or ecosystem if its presence in that region is the result of only local natural evolution (though often popularised as "with no human intervention") during history. The term is equivalent to the concept of indigenous or autochthonous species. A wild organism (as opposed to a domesticated organism) is known as an introduced species within the regions where it was anthropogenically introduced. If an introduced species causes substantial ecological, environmental, and/or economic damage, it may be regarded more specifically as an invasive species. A native species in a location is not necessarily also endemic to that location. Endemic species are ''exclusively'' found in a particular place. A native species may occur in areas other than the one under consideration. The terms endemic and native also do not imply that an organism necessarily first originated or evolved where it is currently found. Notion The notio ... [...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] |
Shrub
A shrub or bush is a small to medium-sized perennial woody plant. Unlike herbaceous plants, shrubs have persistent woody stems above the ground. Shrubs can be either deciduous or evergreen. They are distinguished from trees by their multiple Plant stem, stems and shorter height, less than tall. Small shrubs, less than tall are sometimes termed as subshrubs. Many botany, botanical groups have species that are shrubs, and others that are trees and herbaceous plants instead. Some define a shrub as less than and a tree as over 6 m. Others use as the cutoff point for classification. Many trees do not reach this mature height because of hostile, less than ideal growing conditions, and resemble shrub-sized plants. Others in such species have the potential to grow taller in ideal conditions. For longevity, most shrubs are classified between Perennial plant, perennials and trees. Some only last about five years in good conditions. Others, usually larger and more woody, live beyond ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
