ibclogo XVI International Botanical Congess


Abstract Number: 2103
Poster No. = 752


PHYLOGENY OF ORCHIDACEAE


Paul Kores, Mia Molvray, University of Oklahoma, Ken Cameron, NYBG, John Freudenstein, Kent State, Mark Chase, RBG Kew


Phylogeny of Orchidaceae has been studied for nearly two centuries. Recent work using vegetative and floral characters has clarified some lineages, but also indicated problems. Contradictions among character suites have led to differing interpretations of major orchid lineages. DNA sequence data from matK, trnL-F, and rbcL provide the first robust tree of infrafamilial relationships. In our analysis, Apostasioideae are sister to the other four subfamilies. Among the remaining subfamilies, Cypripedioideae are sister to monandrous orchids, and Vanilloideae are sister to a clade comprised of Epidendroideae and Orchidoideae. These results differ from recent morphological studies in the placement of Vanilloideae and in relationships within Orchidoideae. The latter can be resolved into three clades: Orchideae, which are sister to Diurideae and Cranichideae.


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