Index Catalog // ScholarsArchive@OSU

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:: plants (2n°45). 10 11 S. Fork Eel R. Sacramento R. San Joaquin R. .. 11a Fresno AAA W---332

Biosystematics of a Western North American polyploid complex in the genus aster

Creator:: Guppy, Geraldine Anne Allen
Abstract:: Species relationships were investigated in a western North American polyploid complex in the genus Aster (Asteraceae). A combination of cytological, genetical, chemical, morphological and numerical approaches was employed. Fifteen presently recognized species were included in the study, and populations were sampled throughout most of the range of the group. Living...
Resource Type:: Dissertation
Full Text:: , meadows and stream banks. Within the group there is considerable variation in leaf morphology and

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:: sunnier areas along clearings, stream banks, and roadsides, though plants in sunnier or drier

A biosystematic study in the genus Aster, section Aster, in western North America

Creator:: Dean, Milton Lee
Abstract:: A biosystematic investigation was undertaken in 15 species and three subspecies of the genus Aster, in western North America. Previous studies had been based entirely on external morphological features, and it was believed that much could be learned about the natural affinities of the taxa by exploring their cytological and...
Resource Type:: Dissertation
Full Text:: meadows and on stream banks, but perhaps they are noticed most often as semi - weedy plants growing

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:: 53' 14. Fort Simpson, N. W. T, A. Bank of MacKenzie River, near mouth of 61 052' 121°22' Harris

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:: smaller inflorescences than in Wyo. to Colo. and w. to 7 Calif., where what is usually called var

Cytotaxonomic studies in the Artemisia ludoviciana polyploid complex of the Pacific Northwest

Creator:: Estes, James R.
Abstract:: The Artemisia ludoviciana polyploid complex is a highly polymorphic assembledge of eight taxa in the Pacific Northwest, with a chromosome base number of x=9. A cytogenetic analysis of this complex was carried out to determine the sources of its variation, the types of polyploidy present, and the genetic processes active...
Resource Type:: Dissertation
Full Text:: occurs along the banks of the Columbia River and its major tributaries, mostly .. 31 below the

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:: , Oregon (123°15'W, 43°301N) on a single green- house bench. Watering and lighting were automatically

Taxonomic studies of the Eucephalus complex of Aster in the Pacific Northwest

Creator:: Thompson, Dennis Dean
Resource Type:: Masters Thesis
Full Text:: Mt. Taseko, latitude 51° 10'N and longitude 123° 45'W (Beamish & Pinder-Moss 690103), and Kinbasket

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

ScholarsArchive@OSU

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

Biosystematics of a Western North American polyploid complex in the genus aster

Morphological and cytological variation in Trillium albidum Freeman (Liliaceae)

A biosystematic study in the genus Aster, section Aster, in western North America

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

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

Cytotaxonomic studies in the Artemisia ludoviciana polyploid complex of the Pacific Northwest

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

Taxonomic studies of the Eucephalus complex of Aster in the Pacific Northwest

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

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