Systematics/Phytogeography / Taxonomie/ Section
Soza, Valerie , Olmstead, Richard .
Evolution of fleshy-fruited Galium (Rubiaceae) in western North America and management considerations for a number of rare taxa.
Previous molecular phylogenetic analyses within tribe Rubieae (Rubiaceae) have identified a well-supported group of four-leaved Galium taxa, designated the Cruciata clade. Monophyly of sectional groups within this clade is currently being tested. One section within the Cruciata clade that is well-supported with chloroplast DNA is a fleshy-fruited group of 17 species distributed in western North America from Oregon south into Mexico, previously described as section Baccogalium. A total of 28 species and infraspecific taxa have been described within the group. With the exception of a few widespread taxa, most are geographically restricted. Six taxa are considered rare, threatened, or endangered in California by the California Native Plant Society (CNPS) and eligible for state listing according to the California Department of Fish and Game Code, and 3 taxa are considered rare in Mexico. Fifteen species have been sampled from the group and used to construct a molecular phylogeny based on 4 chloroplast regions and nuclear ribosomal DNA to elucidate evolutionary relationships and aid in conservation management. Our results indicate that infraspecific taxa of several species complexes, including CNPS-listed infraspecific taxa, are more distantly related than previously considered, with closest relatives being geographically proximate species. Other CNPS-listed taxa are geographically restricted, with closest relatives in Baja California.
Log in to add this item to your schedule
1 - University of Washington, Department of Biology, Box 355325, Seattle, WA, 98195-5325, USA
2 - University of Washington, Department of Biology, Box 355325, Seattle, Washington, 98195-5325, USA
Presentation Type: Oral Paper:Papers for Sections
Date: Wednesday, July 30th, 2008
Time: 8:15 AM