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Abstract Detail



Systematics Section/ASPT

Jang, Timothy [1], Guilliams, C. Matt [1], Baldwin, Bruce [1].

Phylogenetic inference in Pectocarya and Harpagonella (Boraginaceae) reveals sectional non-monophyly and supports recognition of a forgotten taxon.

Pectocarya and Harpagonella are close relatives in subtribe Cryptanthinae (Boraginaceae). Pectocarya, or combseed, is a small genus of 14 diminutive annual herbs distributed amphitropically between western North America and South America. Pectocarya taxa are placed in two sections: sect. Gruvelia and sect. Pectocarya. Harpagonella is a monotypic North American genus containing only H. palmeri, or Palmer’s grappling hook, although early 20th century treatments recognized two geographically non-overlapping infraspecific taxa: H. palmeri var. arizonica of Arizona and H. palmeri var. palmeri of southern California and adjacent Baja California, Mexico. Here we present an updated phylogenetic study of these two genera. Our primary goals were to evaluate the monophyly of each genus, the monophyly of sections of Pectocarya, and to examine species circumscriptions. We gathered DNA sequence data from the nuclear ribosomal internal and external transcribed spacer regions as well as psbJ-petA, rpl16, rps16, trnK-rps16, and trnL-trnF regions of the chloroplast genome. Separate analyses of the nuclear and chloroplast DNA data each show a monophyletic Harpagonella nested within a non-monophyletic Pectocarya. Pectocarya sect. Pectocarya is monophyletic in both analyses, but sect. Gruvelia is non-monophyletic. Within Harpagonella, we find strong support for two taxa, which may be best treated at species rank. Within Pectocarya, samples are often recovered in clades by minimum-rank taxon, supporting some but not all current species circumscriptions. At least three long-distance dispersal events are necessary to explain the observed biogeographic patterns in Pectocarya based on the phylogeny, a relatively large number given the size of the genus.


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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

Keywords:
none specified

Presentation Type: Poster:Posters for Sections
Session: P
Location: Eyrie/Boise Centre
Date: Monday, July 28th, 2014
Time: 5:30 PM
Number: PSY033
Abstract ID:324
Candidate for Awards:None


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