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1Botany and Plant Pathology Section, Colorado Agriculture Experiment Station, Fort Collins, Colorado
1
Revised manuscript received October 28, 1964.
2
Published with the approval of the Director, Colorado Agricultural Experiment Station, Fort Collins, Colorado as Scientific Series Paper No. 783. Report of work supported by allotments under Section 9b, 3, Bankhead-Jones, Title I. W-11. Studies on physiological and ecological factors related to weed control. Part of this work was included in a thesis by R. S. Mellor, submitted in partial fulfillment of the requirements for the M. S. degree.