ibclogo XVI International Botanical Congess

Abstract Number: 6127
Poster No. = 2519


PHYLOGENETIC RELATIONSHIPS IN PHORADENDREAE (VISCACEAE). I. MAJOR LINEAGES AND POLYPHYLY OF PHORADENDRON AND DENDROPHTHORA


Vanessa E. T. M. Ashworth, Rancho Santa Ana Botanic Garden and Claremont Graduate School, 1500 North College Avenue, Claremont, CA 91711-3157


The tribe Phoradendreae includes two genera, Phoradendron and Dendrophthora, that are morphologically very similar but differ in the number of locules per anther. Relationships within and between genera are unknown. This study addresses these issues using sequences from three regions of the nuclear ribosomal DNA (nrDNA) cistron. They are (1) the ITS region, (2) the D2 divergent domain and flanking sequences of the 26S nrDNA, and (3) the D8 divergent domain and flanks of the 26S nrDNA. Maximum parsimony analyses suggest that neither Phoradendron nor Dendrophthora is monophyletic. Three major clades were identified whose topologies suggest that characters traditionally used for primary subdivision are homoplastic.

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