Internal transcribed spacer phylogeny of the Asian and eastern North American disjunct Aralia sect. Dimorphanthus (Araliaceae) and its biogeographic implications.

摘要: Sequences of the internal transcribed spacer (ITS) regions nuclear ribosomal DNA were used to generate a phylogenetic hypothesis for Asian and eastern North American disjunct Aralia sect. Dimorphanthus. The ITS phylogeny supports transfer hispida Hispidae Dimorphanthus maintain monophyly latter. north temperate series was paraphyletic, with subtropical tropical Chinensis Foliolosae nested within. This pattern differentiation is consistent morphological stasis among closely related taxa between Asia America in There lack direct intercontinental sister species relationship section. (Aralia spinosa A. hispida) are cladistically basal, Asiatic form clade, which indicates that formation disjunction prior diversification ta...