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Abstract Detail


Systematics/Phytogeography / Taxonomie/ Section

Silveira, Michael [1], Simpson, Michael [2].

Systematics of the Mesamints: Pogogyne (Lamiaceae).

Pogogyne (Lamiaceae) is a small genus of annual plants, which occur almost entirely in California vernal pools. Two San Diego County species - P. abramsii and P. nudiuscula - are federally endangered. Little has been known about the phylogenetic relationships of this complex. Molecular sequence data from chloroplast and nuclear genomes were collected for all seven described, extant species and several putative outgroups. Both parsimony and Bayesian phylogeny reconstruction methods were used to infer relationships within the genus. These preliminary data indicate that subgenus Hedeomoides (consisting of P. floribunda, P. serpylloides, and P. ziziphoroides) is monophyletic and defined by a reduction in stamen number from four to two and a generally reduced flower size. Subgenus Pogogyne (consisting of P. abramsii, P. clareana, P. douglasii, and P. nudiuscula) is paraphyletic, with P. douglasii forming a basal grade. Adaptation to a vernal pool habitat appears to be apomorphic for the genus as a whole, with two, independent reversals (to periodic stream and grasslands) within the genus. These analyses will provide a baseline for classification and species delimitation, which may be valuable in conservation efforts for both these plants and their fragile habitat.


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1 - San Diego State University, Department of Biology, San Diego, CA, 92182, USA
2 - San Diego State University, Department of Biology, San Diego, California, 92182-4614, USA

Keywords:
vernal pool
Pogogyne
Mentheae
Lamiaceae
phylogenetics
character evolution.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Ball Room & Party Room/SUB
Date: Monday, July 28th, 2008
Time: 12:30 PM
Number: PSP064
Abstract ID:761


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