Polystichum
Polystichum (family Aspleniaceae) A genus of leptosporangiate ferns with spine-toothed pinnules, and rounded, superficial sori with circular peltate indusia; the leaves are of a leathery texture. There are some 135 species, of cosmopolitan distribution.
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Centrifugal Speciation , centrifugal speciation The principle that new species are likely to arise towards the centre of the range of the present species, rather than at the… Vicarious Distribution , vicarious distribution The distribution that results from the replacement of one member of a species pair (i.e. two closely related species derived f… Indifferent Species , indifferent species A species with no real affinity for any particular community, but which is not rare (as an accidental species would be). It is fi… Reserpine , Rauvolfia (family Apocynaceae) A genus of shrubs or small trees, some species of which, especially R. serpentina, produce the alkaloid reserpine, use… Round , round / round/ • adj. 1. shaped like or approximately like a circle or cylinder: she was seated at a small, round table. ∎ having a curved shape like… Constellation Diagram , constellation diagram A representation of species affinities that is based on χ2 as a measure of the association between species. The reciprocal of t…
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Polystichum