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Creator:: Thompson, Dennis Dean
Resource Type:: Masters Thesis
Full Text:: the Pacific Northwest AN ABSTRACT OF THE THESIS OF Dennis Dean Thompson for the degree Master of

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:: Coast sampling 16 different populations. Counting the root tips of three plants per accession, he

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:: , the contri- butions of several were outstanding. Dr. Curt Carlbom and Mr. Dennis Jacques helped to

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:: how high they had to climb: Steve Mason, Robert Whitacre, Alice Lindahl, Dennis Green ley and Gail

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:: during the course of this study. Mrs. LaRea Dennis Johnston and Mr. Ronald J. Tyrl also provided

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:: . Thanks are also due Mrs. La Rea Dennis Johnston, from whom I have learned much of taxonomy. I gratefully

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