Systematics Section / ASPT
Still, Shannon , Potter, Daniel .
Phylogenetic relationships in tribe Spiraeeae (Rosaceae) inferred from nucleotide sequence data.
Tribe Spiraeeae has generally been defined to include Aruncus, Kelseya, Luetkea, Petrophyton, Sibiraea, and Spiraea. Recent phylogenetic analyses of Rosaceae have supported the monophyly of a group including those genera (although Sibiraea has not yet been sampled) plus Holodiscus, formerly classified in Tribe Holodisceae because fruits in this genus are achenes rather than follicles. Spiraea, with 50-100 species distributed throughout the north temperate regions of the world, is by far the largest and most widespread genus in the group. The remaining genera have one to several species each and most of them are confined to North America. Phylogenetic analyses of nucleotide sequences from the nuclear (ITS) and chloroplast (matK, trnL-F) genomes support monophyly of a group including Kelseya, Petrophyton, and Spiraea, which is sister to a clade including the other genera. Within Spiraea, none of the three sections defined by Rehder based on inflorescence morphology is supported as monophyletic. Phylogenetic analyses suggest that there have been several biogeographic events involving vicariance or dispersal between the Old and New Worlds within this group.
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1 - University of California Davis, Section of Plant Biology, One Shields Avenue, Davis, California, 95616-8537, USA
Presentation Type: Oral Paper
Location: Salon G - Austin Grand Ballroom/Hilton
Date: Wednesday, August 17th, 2005
Time: 11:00 AM