Systematics/Phytogeography / Taxonomie/ Section
Walden, Genevieve K. , Garrison, Laura , Patterson, Robert .
Phylogenetic analysis of Phacelia (Boraginaceae) inferred from chloroplast ndhF and nuclear ribosomal internal transcribed spacer (nrITS) region sequences.
The genus Phacelia (Boraginaceae) contains two hundred annual and perennial species distributed in North and South America, with the majority of species occurring in western North America. Within the genus there are widespread species as well as narrow endemics, and species occupying an array of habitats from sea level to montane regions. Traditional taxonomy in the genus, based on morphological characters and chromosome numbers, recognizes three subgenera, five sections and seven subsectional groups. Recent molecular phylogenetic studies of several specific infrageneric generic groups have addressed their monophyly as well as relationships among their members. Yet to date only a portion of the genus has been sampled or analyzed, making it difficult to address genus-wide phylogenetic patterns. This study aims to address deep branch phylogenetic patterns within Phacelia and fill sampling gaps across the genus. Previous studies account for nineteen species using chloroplast ndhF (10%), and eighty species using nrITS (40%). Data so far suggest that some recognized traditional taxonomic groups are monophyletic, while others are not, although some sections when combined have monophyletic support. Groups based primarily on chromosome number are not always monophyletic. Future work includes sampling across each major described taxonomic group, as well as samples from South America and Mexico, rare and endangered taxa, and perennials and annuals to infer phylogenetic relationships.
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1 - San Francisco State University, Department of Biology, 1600 Holloway Avenue, San Francisco, California, 94132
Presentation Type: Poster:Posters for Sections
Location: Ball Room & Party Room/SUB
Date: Monday, July 28th, 2008
Time: 12:30 PM