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(American Journal of Botany. 2002;89:966-971.)
© 2002 Botanical Society of America, Inc.

Systematics

Discordance of chloroplast and nuclear ribosomal DNA data in Osmorhiza (Apiaceae)1

Ki-Oug Yoo, Porter P. Lowry II and Jun Wen4

Department of Botany, The Field Museum of Natural History, 1400 S. Lake Shore Drive, Chicago, Illinois 60605-2496 USA; Missouri Botanical Garden, P. O. Box 299, St. Louis, Missouri 63166-0299 USA; and Laboratoire de Phanérogamie, Muséum National d'Histoire Naturelle, 16 rue Buffon, 75005 Paris, France

Phylogenetic studies were conducted to evaluate interspecific relationships in Osmorhiza (Apiaceae: Apioideae) using sequences of the ITS regions of nuclear ribosomal DNA, the chloroplast ndhF gene, and two noncoding regions (trnL intron, and trnL [UAA] 3' exon-trnF [GAA] intergenic spacer). All data sets suggest the monophyly of the New World taxa and showed that Osmorhiza aristata from Asia is relatively divergent from other members of the genus, even though it is morphologically similar to the eastern North American O. claytonii and O. longistylis. The ITS and chloroplast DNA trees differ in the relationships among the New World taxa, especially the phylogenetic position of O. occidentalis, O. glabrata, and O. depauperata. The lack of congruence between the two data sets may be a result of hybridization or introgression. Although there is high discordance between nrITS and two chloroplast DNA data sets, the latter two show similar topologies.

Key Words: Apiaceae • chloroplast DNA • ITS • ndhF, trnL-trnF noncoding region • Osmorhiza • phylogeny




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