Abstract
Abstract Phylogenetic analyses of DNA sequences of six species of Platanus were conducted to estimate species relationships and analyze biogeographic history. On the basis of a broader analysis of the third exon of the nuclear gene LEAFY, the root node for the genus was confirmed to fall between subg. Castaneophyllum (P. kerrii) and the species of subg. Platanus. Separate phylogenetic analyses of the nuclear ribosomal ITS region, the 3′ region of the second intron of LEAFY, and the chloroplast region trnT-trnL intergenic spacer provided various levels of resolution, and the combined data yielded a fully resolved set of relationships within subg. Platanus. Two major clades were identified: one with species from Europe (EUR) and western North America (WNA) (P. orientalis, P. racemosa s.l.), the other with species from eastern North America (ENA; US and Canada) and eastern Mexico (EMEX) (P. mexicana, P. occidentalis, and P. rzedowskii). Within subg. Platanus, six subclades corresponded to previously recogniz...
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