Graduate Thesis Or Dissertation
 

A systematic study of Lathyrus vestitus Nutt. ex T. & G. (Fabaceae) and allied species of the Pacific Coast

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  • Eight species of Lathvrus (Fabaceae, Faboideae) endemic to the Pacific Coast of North America were the subject of a systematic investigation. Taxa studied included Lathvrus vestitus, Nutt. ex T. & G., L. laetif lorus Greene, L.. iepsonii Greene, £,. splendens Kellogg, L. polvphvllus, Nutt. ex T. & G., L. holochlorus (Piper) C. L. Hitchcock, L. delnorticus C. L. Hitchcock and L,. sulphureus Brewer. Taximetric studies, including hierarchical and non-hierarchical cluster analyses followed by discriminant analyses, revealed the existence of one new species. Lathvrus holochlorus. L.. delnorticus. L. sulphureus. L. polvphvllus. L. iepsonii and L. splendens were found to be morphologically distinct while extensive morphological intergradation was found between L. vestitus and L.. laetiflorus. Principal Components analysis was used to document two clinal trends within the L.. vestitus-laetiflorus, complex. Flower size increases and floral shape changes from north to south along the Pacific Coast; pubescence increases clinally from north to south and from the coast inland. The anatomy of stems and leaflets was examined by tissue clearing methods. Vascular anatomy of nodes and internodes was found to conform to patterns described previously for European species of Lathvrus. Epidermal cell shape and stomatal frequency on leaflets varies greatly within species and these data were not useful for taxonomic distinctions. The diploid chromosome number for all species studied was found to be 2n = 14; only small differences in karyotypes could be noted. Preliminary studies of breeding systems in Lathvrus vestitus. L. polvphyllus and L. holochlorus revealed these perennial herbaceous species to be self-incompatible, obligate outcrossers dependent primarily upon large bees for pollination. The new species, named Lathvrus glandulosus. is described; plants referable to L.. vestitus and L. laetiflorus are reorganized into five subspecies under the former name. A key and descriptions for all species of Lathvrus. native and introduced, found west of the Sierra-Cascade Crest in Washington, Oregon and California is presented.
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