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  • 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:
    reproductive individuals. Predispersal seed predation, damage by introduced mountain goats, and drought may

  • Reconnaissance botany of alpine ecosystems on Prince of Wales Island, southeast Alaska

    Creator:
    Jaques, Dennis Randall
    Abstract:
    A study of the Prince of Wales Island alpine areas was undertaken to determine what species occur in the region and to describe plant communities making up the alpine vegetation. For one month in 1972, specimens were collected and 78 micro-plots were analyzed for cover, frequency and constancy data. Three...
    Resource Type:
    Masters Thesis

  • 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:
    Cytogeography of Achillea Millefolium L. in Western Oregon

  • 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:
    Biosystematics of the Mimulus nanus complex in Oregon AN

  • 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

  • Origin and distribution of polyploid Achillea (Compositae) in western North America

    Creator:
    Tyrl, Ronald J.
    Abstract:
    A cytogeographical study was made of populations of tetraploid (n=18) and hexaploid (n=27) Achillea millefolium (Compositae- Anthemideae) from the Pacific Coast states. There is a complex distributional pattern, involving overlapping ranges, mixed populations, migration of one form into areas occuplied by the other, pentaploid hybrids, and septaploid and octoploid plants....
    Resource Type:
    Dissertation
    Full Text:
    Oregon, northwestern California, and northwestern Washington, are corre- lated with the distinctive

  • A biosystematic study of some North American species of Agrostis L. and Podagrostis (Griseb.) Scribn. & Merr.

    Creator:
    Carlbom, Curt Gerald, 1932-
    Abstract:
    A taxonomic investigation was made of 24 taxa belonging to the section Trichodium (Michx.) Trin., of Agrostis, and the genus Podagrostis. Experimental methods were employed, including: uniform garden culture of transplants and plants grown from seeds collected in natural populations; breeding studies; physiological and phenological investigations; cytological studies; ecological studies...
    Resource Type:
    Dissertation
    Full Text:
    . Nevada Co. : Donner Pass Summit. 48 Siskiyou Co. : Mt. Shasta. 60 OREGON. Harney Co.: Steens Mt., 1

  • The gene-ecology of Crepis nana Richardson and Crepis elegans Hooker in Arctic and Alpine North America

    Creator:
    Legge, Allan Herbert, 1942-
    Abstract:
    A gene-ecological transplant study was made on populations of the Crepis nana and C. elegans complex from the Arctic and Alpine of North America. Transplants were collected from the Brooks Range, Eagle Summit, and Alaska Range in Alaska, the Rocky Mountains in Alberta, the Olympic Mountains in Washington, the Wallowa...
    Resource Type:
    Dissertation
    Full Text:
    Oregon, and the Sierra Nevada Mountains of California. Chromosome numbers were found to be uniformly 2N

  • 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:
    (Hydrophyllaceae), a Species Endemic to Serpentine Soils in Southwestern Oregon AN ABSTRACT OF THE THESIS OF J

  • 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:
    diaphanus is a rare plant endemic to the John Day River drainage of north-central Oregon. This species has