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  • Systematic and reproductive studies of Mimulus (Scrophulariaceae) in the Pacific Northwest : implications for conservation biology

    Creator:
    Meinke, Robert James
    Abstract:
    The Mimulus washingtonensis complex is a group of morphologically similar species centered in the Pacific Northwest. All are rare, and most are under consideration for listing as endangered. Morphometric and pollination data were used in developing a revised taxonomy for the group. Five species and two varieties are recognized. Mimulus...
    Resource Type:
    Dissertation
    Full Text:
    spontaneously in soil collected at type locality of M. hymenophyllus in Wallowa County, Oregon. 2-23. Scanning

  • Cytogeography of Achillea millefolium L. in western Oregon

    Creator:
    Tyrl, Ronald J.
    Abstract:
    A cytogeographic study, the relationship between chromosome number and geographical and ecological distribution, was made of the tetraploid and hexaploid chromosome forms of Achillea millefolium L. in western Oregon. Principal objectives of the investigation were three. First was a determination of the exact distributions of the two levels, as previous...
    Resource Type:
    Masters Thesis
    Full Text:
    Oregon State University in partial fulfillment of the requirements for the degree of Master of

  • Morphological and cytological variation in Trillium albidum Freeman (Liliaceae)

    Creator:
    Bledsoe, Karen E.
    Abstract:
    This work was performed on Trillium albidum Freeman (Liliaceae), to clarify the pattern of morphological variation between the small-flowered populations at the northern limit of its range ( T. parviflorum Soukup) and the larger-flowered populations from southern Oregon and northern California. It was hypothesized that only a single species of...
    Resource Type:
    Masters Thesis
    Full Text:
    Oregon white oak and young Douglas fir. MacDonald Forest (MCDF). Benton County, OR. Township 11 South

  • Biosystematics of the Mimulus nanus complex in Oregon

    Creator:
    Ezell, Wayland Lee, 1937-
    Abstract:
    A biosystematic study was made in seven populations of Mimulus nanus Hook. & Arn. and M. cusickii (Greene) Piper (Scrophulariaceae) in central Oregon, and a taxonomic revision was made of the four species of section Eunanus reported from Oregon--M. nanus, M. cusickii, M. clivicola Greenm. and M. jepsonii Grant. Mimulus...
    Resource Type:
    Dissertation
    Full Text:
    , Klamath County, in a lodgepole pine (Pinus contorta var. murrayana) forest. Site 130 is 22 miles south of

  • Hybridization between Arctostaphylos viscida and A. canescens in Oregon

    Creator:
    Gottlieb, Leslie D., 1936-
    Abstract:
    Arctostaphylos viscida Parry and A. canescens Eastw., two well-known and frequently encountered manzanitas in the Siskiyou Mountains in southwestern Oregon, are shown to hybridize and to produce an extensive series of morphological intermediates. The hybridization occurs wherever populations of these two species meet at contact zones of serpentine and non-serpentine...
    Resource Type:
    Masters Thesis
    Full Text:
    . Canescens in Oregon AN ABSTRACT OF THE THESIS OF Leslie David Gottlieb for the Master of Science (Name

  • Biosystematic studies of Phacelia capitata (Hydrophyllaceae), a species endemic to serpentine soils in southwestern Oregon

    Creator:
    Shelly, J. Stephen
    Abstract:
    Phacelia capitata Rruckeberg is a member of the Phacelia magellanica polyploid complex (species group Magellanicae), a group of wide-ranging, polymorphic perennials in western North America related to the South American P. secunda (= P. magellanica). The purpose of this project was to determine, to the extent possible, the interrelationships of...
    Resource Type:
    Masters Thesis
    Full Text:
    Serpentine Soils in Southwestern Oregon Redacted for privacy Abstract approved: Renton L. Chambers

  • A systematic and ecological study of Astragalus diaphanus (Fabaceae)

    Creator:
    Wright, Carolyn E.
    Abstract:
    Astragalus diaphanus is a rare plant endemic to the John Day River drainage of north-central Oregon. This species has several interesting features, including the dimorphism of its fruit and its geographical isolation from the two nearest taxonomically related species, which occur in Colorado. This study addressed the species' distribution and...
    Resource Type:
    Masters Thesis
    Full Text:
    Astragalus diaphanus by 12 county in Oregon. 3. Selected soil characteristics at three sites of A. diaphanus

  • Autecology, reproductive ecology, and demography of Astragalus australis var. olympicus (Fabaceae)

    Creator:
    Kaye, Thomas N.
    Abstract:
    The goal of this study was to gather information on the autecology, reproductive ecology, and population dynamics of Astragalus australis var. olympicus as a baseline for conservation strategies and to help explain its restricted range. Approximately four thousand individuals occurred in four known population centers in the Olympic Mountains, Olympic...
    Resource Type:
    Masters Thesis
    Full Text:
    Oregon State University in partial fulfillment of the requirements for the degree of Master of Science

  • Taxonomy and ecology of Mentzelia mollis Peck and related species

    Creator:
    Glad, Judith B.
    Abstract:
    A study was made to clarify the relationships of Mentzelia mollis Peck and two poorly understood taxa of Mentzelia (Loasaceae) to the other members of the genus, its sections, and its subsections, and to describe the general ecology of each taxon. Within the genus, the section Trachyphytum is characterized by...
    Resource Type:
    Masters Thesis
    Full Text:
    Creek drainage of Malheur County, Oregon and Owyhee County, Idaho. The Leslie Gulch Mentzelia occurs

  • The ecology and reproduction of Sophora leachiana Peck (Fabaceae)

    Creator:
    Crowder, Cheryl Alison
    Abstract:
    The goal of the study was to collect data on the ecology and reproduction of Sophora leachiana in order to help explain the rarity and restricted range of this species. There are 13 known populations of S. leachiana, occurring in a 29 by 6.4 km area in the Siskiyou Mountains...
    Resource Type:
    Masters Thesis
    Full Text:
    occupies, but it does not allow for expansion of the species range. Forest clear-cuts are a favorable