Index Catalog // ScholarsArchive@OSU

An experimental taxonomic study of a northwest American polyploid species, Scrophularia lanceolata pursh

Creator:: Carlbom, Curt Gerald, 1932-
Resource Type:: Masters Thesis

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

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

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

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

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

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

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

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

A chemosystematic study of the phylogenetic position of Arabidopsis thaliana (L.) heynh. (Brassicaceae) employing numerical methods

Creator:: Kaplan, Hesh J.
Abstract:: The Brassicaceae, Mustard Family, is a well marked natural family, whose tetramerous flowers, tetradynamous stamens, and distinctive bi- carpellary fruits, clearly distinguish it from related families. It is a large family of some 3, 000 recognized species and over 300 genera. Although numerous attempts have been made over the past...
Resource Type:: Dissertation

ScholarsArchive@OSU

An experimental taxonomic study of a northwest American polyploid species, Scrophularia lanceolata pursh

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

Hybridization between Arctostaphylos viscida and A. canescens in Oregon

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

Cytogeography of Achillea millefolium L. in western Oregon

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

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

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

Biosystematics of the Mimulus nanus complex in Oregon

A chemosystematic study of the phylogenetic position of Arabidopsis thaliana (L.) heynh. (Brassicaceae) employing numerical methods

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