Phylogeny and biogeography of Chamaecyparis (Cupressaceae) inferred from DNA sequences of the nuclear ribosomal ITS region

摘要

Phylogenetic analyses of the five extant species of Chamaecyparis (Cupressaceae) based on mDNA ITS sequences yield a single most parsimonious tree in which C. pisifera (Japan) and C. formosensis (Taiwan) form a clade that is sister to a clade including C. lawsoniana (western North America) and C. obtusa (Japan and Taiwan) plus C. thyoides (eastern North America). Dispersal-vicariance analyses (DIVA) suggest a minimum of two dispersal events between eastern Asia and North America.