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Filtering by: Creator Galloway, Aaron W. E. Remove constraint Creator: Galloway, Aaron W. E. Degree Field Botany and Plant Pathology Remove constraint Degree Field: Botany and Plant Pathology

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  • Fescue taxonomy in the Pacific coast states

    Creator:
    Wilson, Barbara L.
    Abstract:
    Accurate taxonomy is essential to preservation and management of native grasses. Four problems in fescue taxonomy were investigated: the identity of the native fescue that dominates western Oregon and Washington prairies, the relationship of native Festuca roemeri to closely related grasses, the status of F. howellii and F. washingtonica, and...
    Resource Type:
    Dissertation
    Full Text:
    Taxonomy in the Pacific Coast States. Abstract approved: Aaron Liston Accurate taxonomy is essential to

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

    Creator:
    Alexander, J. Andrew
    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,...
    Resource Type:
    Dissertation
    Full Text:
    : _______________________________________________ Aaron I. Liston North America, with over 400 species of Astragalus (Fabaceae), is one of three

  • Molecular systematic studies in the genus Ribes (Grossulariaceae)

    Creator:
    Messinger, Wes
    Abstract:
    Infrageneric classification in Ribes has previously relied on a few, often conflicting, morphological markers, such as spines, glands, and inflorescence morphology. Suggestions that hybridization drives the evolution of the genus have not been tested using phylogenetic methods. To assess the validity of infrageneric classifications and the importance of hybridization to...
    Resource Type:
    Masters Thesis
    Full Text:
    --(Circumboreal) N. America, E. Asia Northern Europe -(W. N. America) W. N. America W. N. America West

  • Molecular phylogenetic analyses of Riccia and Marchantiales

    Creator:
    Wheeler, John A. (John Allen)
    Resource Type:
    Dissertation
    Full Text:
    Riccia and Marchantiales. Abstract approved: Aaron Liston This dissertation consists of three

  • Unearthing the Cretaceous Diversification of Cornales

    Creator:
    Atkinson, Brian A.
    Abstract:
    The order Cornales (dogwoods) is the earliest diverging lineage within the most diverse group of flowering plants, the asterids (>80,000 species). Although molecular phylogenetics have significantly improved our understanding of cornalean systematics, early phylogenetic relationships remain uncertain due to an initial rapid radiation. The fossil record of Cornales is extensive...
    Resource Type:
    Dissertation
    Full Text:
    : _____________________________________________________________________ Aaron I. Liston The order Cornales (dogwoods) is the earliest diverging lineage within the

  • The influence of pollinators on the maintenance of mixed mating in a population of the blue columbine, Aquilegia coerulea (Ranunculaceae)

    Creator:
    Sweet, Heather R.
    Abstract:
    Pollination ecology may play an important role in the maintenance of selfing in populations of self-compatible hermaphroditic plants where both selfing and outcrossing occur (mixed mating). Behavior and abundance of pollinators can influence the two major modes of selfing; autogamy (selfing within a flower) and geitonogamy (selfing between flowers on...
    Resource Type:
    Masters Thesis
    Full Text:
    : Johanne Brunet Aaron I. Liston Pollination ecology may

  • Conservation genetics of Kincaid's lupine : a threatened plant of western Oregon and southwest Washington grasslands

    Creator:
    Severns, Paul M.
    Abstract:
    Kincaid's lupine (Lupinus oreganus Heller) is a federally listed threatened species native to remnant grassland of western Oregon and southwestern Washington, and is the primary larval host plant of a once thought extinct butterfly, Plebejus icarioides fenderi Macy. Past studies concerning Kincaid's lupine reproduction suggested that populations may suffer reductions...
    Resource Type:
    Dissertation
    Full Text:
    Grasslands Abstract approved: Aaron Liston Mark V. Wilson

  • Genomic Investigations of Diversity within the Milkweed Genus Asclepias, at Multiple Scales

    Creator:
    Weitemier, Kevin A.
    Abstract:
    At a time when the biodiversity on Earth is being rapidly lost, new technologies and methods in genomic analysis are fortunately allowing scientists to catalog and explore the diversity that remains more efficiently and precisely. The studies in this dissertation investigate genomic diversity within the milkweed genus, Asclepias, at multiple...
    Resource Type:
    Dissertation
    Full Text:
    Abstract approved: ________________________________________________________________________ Aaron I

  • Landscape Genomics and Climatic Responses of Willamette Valley Alders

    Creator:
    Kral, George L.
    Abstract:
    The climate of the Pacific Northwest is in flux, and existing forest ecosystems are stressed and poised to shift in fundamental ways, with or without human intervention. This dissertation probes the nature of forest responses to environmental change through investigations of morphology and genetics of three species of alder co-occurring...
    Resource Type:
    Dissertation
    Full Text:
    approved: ______________________________________________________ Aaron I. Liston The climate

  • A fistful of Astragalus : phenotypic and genotypic basis of the most taxon rich species in the North American flora

    Creator:
    Knaus, Brian J.
    Abstract:
    The study of the infra-specific ranks (i.e., subspecies and variety) can be considered the study of the process of speciation. Astragalus lentiginosus Douglas ex Hooker (Fabaceae) is the most taxon rich species in the U.S. flora currently including 40 taxonomic varieties. These varieties were described using traditional taxonomic methods primarily...
    Resource Type:
    Dissertation
    Full Text:
    : _____________________________________________________________________ Rich Cronn Aaron Liston The study of the infra-specific ranks (i.e., subspecies and