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Filtering by: Creator Wheeler, Edmund J. Remove constraint Creator: Wheeler, Edmund J. Contributor advisor sim Chambers, Kenton L. Remove constraint Contributor advisor sim: Chambers, Kenton L.

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  • A revision of Juncus subgenus genuini (Juncaceae) in the Pacific states

    Creator:
    Lint, Harold LeRoy
    Abstract:
    A study was made of the subgenus Genuini of the genus Juncus in the Pacific States, California, Oregon and Washington. Extensive morphological comparisons, geographical distributions, habitat differences and observations of apparent presence or absence of natural hybrids provided the major data sources. Cytological studies were made, but were inconclusive. Eleven...
    Resource Type:
    Dissertation
    Full Text:
    five subspecies, J. effusus subsp. pacificus, subsp pugetensi and subsp. austrocalifornicus; J

  • 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

  • Phenotypic variation in diploid and tetraploid populations of Claytonia perfoliata (s.l.) (Portulacaceae)

    Creator:
    Miller, John M.
    Abstract:
    Meiotic chromosome counts from 200 populations of Claytonia (Montia) perfoliata (sensu lato) reveal a polyploid pillar complex based on three morphologically different, chemically distinct, and geographically defined diploids. The basic chromosome number is x=6. Diploid C. perfoliata Willdenow with linear juvenile leaves and deltoid mature basal leaves ranges southeastward from...
    Resource Type:
    Dissertation
    Full Text:
    (1834) and T. J. Howell (1893) respectively, and in many past taxonomic treatments these two epi

  • Ecology and reproduction in Collomia macrocalyx Brand (Polemoniaceae)

    Creator:
    Joyal, Elaine
    Abstract:
    Populations of Collom ia macrocalyx Brand were located and observed in order to determine the distribution, ecology, and reproductive biology of this species and probable relationships to other members of the genus. The purpose of the study was to obtain information that would explain the restricted range of the species...
    Resource Type:
    Masters Thesis
    Full Text:
    often. Ron Halvorsen, Prineville B. L.M. , provided aerial photographs and mapsof Wheeler and Wasco

  • 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:
    the translucent pods. It was not recorded again until Joseph Howell and Thomas J. Howell collected

  • 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

  • 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:
    . Vickery, Jr. , Dr. Wesley 0. Griesel, Dr. Ronald J. Tyrl, Mr. Allan H. Legge and Mr. Robert L. Carr. A

  • Taxonomy of Phacelia section Miltitzia (hydrophyllaceae)

    Creator:
    Halse, Richard R.
    Abstract:
    A systematic study was made of the species comprising Phacelia section Miltitzia. These species, which are commonly found in the Great Basin physiographic province of western North America, are distinguished from other members of Phacelia by their yellow, marcescent corollas and their transversely corrugated seeds. This project utilized morphological, cytological,...
    Resource Type:
    Dissertation
    Full Text:
    major Chairman of Department of Botany and Plant Pathology Date thesis is presented j /c7f Typed by

  • Polymorphic, sympatric flavonoid variants of Claytonia perfoliata Donn from the Columbia River Gorge

    Creator:
    Miller, John M.
    Abstract:
    Claytonia perfoliata is a west-American polyploid complex of common annuals (x=6). The species is polymorphic; exomorphic characters are often variable within local populations. In a transect of the Columbia River Gorge diploids, tetraploids, hexaploids, octoploids, and decaploids were collected, which varied in shape of basal and cauline leaves, degree of...
    Resource Type:
    Masters Thesis
    Full Text:
    wishes to thank Dr. B. G. Brehm, Dr. N. I. Bishop, and Dr. H. J. Evans for advice and access to special

  • 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:
    -being. Particular thanks go to Thomas Kaye, Dr. Steven Broich, Nancy Fredricks, J. Stephen Shelly, Dr