Systematics Section / ASPT
Moore, Abigail J. , Baldwin, Bruce G. .
A molecular phylogeny of North American Grindelia (Astereae).
GRINDELIA grows in dry areas of the New World. It has a disjunct distribution with approximately half the species (25) in the western part of the United States and Mexico and the other half (ca. 20-45) in Argentina and Chile. Throughout its range, Grindelia is distinguished by having phyllaries with herbaceous, often recurved apices; yellow ray flowers (when present); a pappus of several flattened awns or narrow scales that are early-deciduous; and a gummy substance on the heads (as well as the leaves of some species). A phylogeny of most of the species of the United States with internal transcribed spacer nuclear sequence data was largely unresolved, but some clades were recovered. Grindelia was monophyletic. Grindelia squarrosa, G. aphanactis, and G. nana formed a clade as did two of the accessions of G. lanceolata and G. havardii (all from Texas). Some of the G. camporum accessions formed a clade separate from the rest of the California accessions, possibly corresponding to differences in chromosome number.
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1 - University of California, Berkeley, Department of Integrative Biology, University and Jepson Herbaria, 1001 Valley Life Sciences Bldg. #2465, Berkeley, California, 94720, USA
Presentation Type: Poster:Posters for Sections
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM