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Abstract Detail

Systematics Section

Halpin, Kate [1], Fishbein, Mark [2].

A phylogeny of Agavaceae subfamily Chlorogaloideae with a focus on species delimitation in Hastingsia: insights from chloroplast DNA sequences.

Serpentine soils throughout the Klamath-Siskiyou region of southwestern Oregon and northern California form a patchy, fragmented landscape. These isolated outcrops contain toxic concentrations of heavy metals, making them unsuitable for most plant species. An incredible diversity of species inhabits serpentine, but these are often rare, endangered and narrowly endemic. Hastingsia (Agavaceae) is a genus of two to four rare species that are mainly restricted to serpentine. The closest relatives of this genus are thought to be Schoenolirion, Chlorogalum, and Camassia, together comprising subfamily Chlorogaloideae. Other than a close relationship between Camassia and Chlorogalum, however, phylogenetic relationships of these genera have gone largely unstudied. Within Hastingsia, recognition of two recently described species has been widely disputed due to the difficulty in consistently observing diagnostic differences. To address the taxonomic status of the newly described H. serpenticola and H. atropurpurea and determine relationships among the genera of Chlorogaloideae, we obtained DNA sequences from 36 specimens sampled across the ranges of all species of Hastingsia and one specimen from each species of Schoenolirion, Chlorogalum, and Camassia. Two non-coding loci from the chloroplast genome, the rpl16 intron and trnD-trnT spacer, were sequenced. Phylogenetic analyses in parsimony, likelihood, and Bayesian frameworks were used to test the monophyly of all species of Hastingsia and estimate relationships within subfamily Chlorogaloideae. Preliminary results suggest that no species of Hastingsia is monophyletic, with some relationships corresponding to better to geography than taxonomy.

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1 - Portland State University, Department of Biology, P.O. Box 751, Portland, OR, 97207, USA
2 - Oklahoma State University, Department of Botany, 104 Life Sciences East, Stillwater, Oklahoma, 74078, USA

species delimitation

Presentation Type: Poster:Posters for BSA Sections
Session: P1
Location: Event Tent/Cliff Lodge
Date: Monday, July 27th, 2009
Time: 5:30 PM
Number: P1SP001
Abstract ID:806