Botrychium
Botrychium (family Ophioglossaceae) A genus of eusporangiate ferns with both the sterile and fertile blades of the leaf pinnately lobed or divided, the massive sporangia subsessile on the fertile pinnae, opening by a transverse slit without a true annulus. There are 23 species, cosmopolitan in distribution, but most are northern temperate.
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Seal , seal, carnivorous aquatic mammal with front and hind feet modified as flippers, or fin-feet. The name seal is sometimes applied broadly to any of the… 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… ring species , ring species A group of subspecies that are contiguous along a cline. Members of each population are able to mate successfully with members of adjace… 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…
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Botrychium