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Variations in Ecotypes of Canada Thistle

Published online by Cambridge University Press:  12 June 2017

Jesse M. Hodgson
Jesse M. Hodgson*
Affiliation:
Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture
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Abstract

Root sections of Canada thistles (Cirsium arvense (L.) Scop.) from 10 locations in Montana, Idaho, Washington, and Wyoming were planted at Bozeman, Montana. Leaf margins varied from deeply ruffled and lobed with numerous spines, to entire margins essentially without spines. Flowers varied in color from shades of purple to pale blue and white. Seed size ranged from 300,000 to 673,000 seeds per pound. The earliest eco-type emerged about 2 weeks before the latest and shoot and flower development and height of plants were varied.

Type
Research Article
Information
Weeds , Volume 12 , Issue 3 , July 1964 , pp. 167 - 171
Copyright
Copyright © 1964 Weed Science Society of America 

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References

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