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A taxonomic revision of Astragalus mokiacensis and allied taxa within the Astragalus lentiginosus complex of Section Diphysi

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dc.contributor.advisor Liston, Aaron
dc.creator Alexander, J. Andrew
dc.date.accessioned 2008-03-17T20:27:15Z
dc.date.available 2008-03-17T20:27:15Z
dc.date.issued 2008-03-17T20:27:15Z
dc.identifier.uri http://hdl.handle.net/1957/8118
dc.description Presentation date: 2007-11-07
dc.description Graduation date: 2008
dc.description.abstract North America, with over 400 species of Astragalus (Fabaceae), is one of three major centers of diversity, all of which comprise the majority of the nearly 1750 species of Astragalus worldwide. One of the most diverse species, Astragalus lentiginosus of Section Diphysi, is a polymorphic complex of over 40 varieties, ranging from the West Coast to Texas and the Rocky Mountains. Palantia was a sectional name within the genus Tium used by Rydberg for taxa formerly reduced by Jones to varieties of A. lentiginosus. They share cylindrical pods that, unlike the rest of A. lentiginosus, do not become bladdery inflated upon maturity. The Palantia, in a modern interpretation, consists of A. mokiacensis and A. bryantii plus the other scarcely inflated varieties of A. lentiginosus, primarily A. lentiginosus var. maricopae, A. lentiginosus var. palans, A. lentiginosus var. ursinus, and A. lentiginosus var. wilsonii. Every major revision has delimited these taxa differently. A principal coordinates analysis of morphological data from herbarium specimens was used to determine the affinities between type specimens and extant populations of these taxa and to determine the degree of morphological similarity among these taxa. For the genetic analysis, highly polymorphic cpDNA microsatellites were selected due to their applicability to both genetic and phylogenetic questions across a wide range of taxonomic levels. Based on the results of the chloroplast haplotype and morphological datasets, the species, A. mokiacensis, A. bryantii, A. iodanthus and A. pseudiodanthus, are recognized as varieties of A. lentiginosus. The taxon recently recognized as A. lentiginosus var. trumbullensis is morphologically similar to the lectotype of Astragalus mokiacensis. Astragalus lentiginosus var. trumbullensis is herein recognized as a low-elevation minor variant and considered a synonym of A. lentiginosus var. mokiacensis. A taxonomic key and complete synonymy are included. en
dc.format.extent 2274784 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.subject Astragalus en
dc.subject Fabaceae en
dc.subject Edward Palmer en
dc.subject nomenclature en
dc.subject microsatellite en
dc.subject chloroplast en
dc.subject principle coordinate analysis en
dc.subject Utah en
dc.subject Arizona en
dc.subject Nevada en
dc.subject.lcsh Astragalus (Plants) -- Classification en
dc.subject.lcsh Astragalus (Plants) -- Phylogeny en
dc.title A taxonomic revision of Astragalus mokiacensis and allied taxa within the Astragalus lentiginosus complex of Section Diphysi en
dc.type Thesis en
dc.degree.name Doctor of Philosophy (Ph. D.) in Botany and Plant Pathology en
dc.degree.level Doctoral en
dc.degree.discipline Science en
dc.degree.grantor Oregon State University en
dc.contributor.committeemember Cronn, Richard
dc.contributor.committeemember Lytle, David
dc.contributor.committeemember Santelmann, Mary
dc.contributor.committeemember Farber, Paul

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