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Abstract Detail

Systematics Section/ASPT

Schneider, Adam C. [1], Guilliams, C. Matt [1], Freyman, Will [1], Springer, Yuri P. [2], Baldwin, Bruce [1].

Phylogenetic relationships in Hesperolinon (Linaceae) inferred from ITS, ETS, and chloroplast sequence data.

Hesperolinon, or dwarf flax, is a genus within Linaceae endemic to the western United States. It comprises 12-13 species, with a center of diversity in Lake and Napa counties of California. Nested within the paraphyletic genus Linum, Hesperolinon has been historically treated as either a section of Linum or a standalone genus based on its petal attachment and appendages, and an ecological affinity to serpentine soils. Recent studies employing a phylogenetic approach have focused on disease ecology and edaphic associations in the genus or its placement within the Linaceae. However, the lack of a well-resolved species-level phylogeny warrants additional study. Here, we present a phylogeny based on nuclear ITS and ETS regions and five chloroplast loci. We include exemplars of 5-22 populations sampled from each widely recognized species and H. sharsmithiae, a taxon described in 2006 but considered synonymous with H. bicarpellatum in the most recent edition of California's vascular plant flora, The Jepson Manual. Consistent with previously published data, H. drymarioides was recovered sister to the rest of the genus. Our results also support species circumscriptions for H. breweri, H. californicum, and the federally and state listed H. congestum. Lack of phylogenetic resolution along the backbone of the tree and within a clade of morphologically diverse taxa found predominantly in Lake and Napa counties may indicate rapid diversification. Future work will focus on adding additional nuclear loci to improve phylogenetic resolution and testing ecological and evolutionary hypotheses in a comparative phylogenetic framework.

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1 - University of California, Berkeley, Integrative Biology, 1001 Valley Life Sciences Bldg. #2465, University of California, Berkeley, Berkeley, CA, 94720-2465, USA
2 - National Ecological Observatory Network, 1685 38th St. Suite 100, Boulder, CO, 80301, USA


Presentation Type: Poster:Posters for Sections
Session: P
Location: Eyrie/Boise Centre
Date: Monday, July 28th, 2014
Time: 5:30 PM
Number: PSY025
Abstract ID:342
Candidate for Awards:None

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