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Bernard Descoings redefined Bryophyllum as 26 species, [1] and molecular phylogenetic analysis shows that his definition is almost monophyletic, except that K. beauverdii and K. delagoensis (hence as well as their relatives and hybrids) should be included while K. pubescens and K. streptantha excluded. [2] [6] Therefore, Bryophyllum comprises ...
Plants are usually monoicous, and sexual reproduction is by antheridia and archegonia. Asexual reproduction occurs by spores, by fragmentation of the rosettes, and by formation of apical tubers. Spores are large (45 to 200 μ) and formed in tetrads. [1] The sporophyte of Riccia is the simplest amongst bryophytes. It consist of only a capsule ...
Marchantia, an example of a liverwort (Marchantiophyta) An example of moss (Bryophyta) on the forest floor in Broken Bow, Oklahoma. Bryophytes (/ ˈ b r aɪ. ə ˌ f aɪ t s /) [1] are a group of land plants (embryophytes), sometimes treated as a taxonomic division, that contains three groups of non-vascular land plants: the liverworts, hornworts, and mosses. [2]
Combined with the five-kingdom model, this created a six-kingdom model, where the kingdom Monera is replaced by the kingdoms Bacteria and Archaea. [16] This six-kingdom model is commonly used in recent US high school biology textbooks, but has received criticism for compromising the current scientific consensus. [ 13 ]
Eclipta prostrata, the false daisy, [3] is a species of plant in the family Asteraceae. It is widespread across much of the world. [4] [5] [6] This plant has cylindrical, grayish roots. Solid, circular, purplish stems with white fine hairs 0.8m. Leaves arranged in opposite pairs, hairy in two-sided, lanceolate, serrated 2–12.5 cm long, 5-35 ...
Secondary growth thickens the stem and roots, typically making them woody.Obstructions such as this metal post and stubs of limbs can be engulfed. In botany, secondary growth is the growth that results from cell division in the cambia or lateral meristems and that causes the stems and roots to thicken, while primary growth is growth that occurs as a result of cell division at the tips of stems ...
A key event in the conservation of plant genetic resources was the establishment of the International Board for Plant Genetic Resources (IBPGR) (now Bioversity International) in 1974, whose mandate was to promote and assist in the worldwide effort to collect and conserve the plant germplasm needed for future research and production. IBPGR ...
A light-harvesting complex consists of a number of chromophores [1] which are complex subunit proteins that may be part of a larger super complex of a photosystem, the functional unit in photosynthesis. It is used by plants and photosynthetic bacteria to collect more of the incoming light than would be captured by the photosynthetic reaction ...