THE BIOLOGY OF CANADIAN WEEDS. 38. Arctium minus (Hill) Bernh. and A. lappa L.

Abstract
Arctium minus (Hill) Bernh., common burdock, and A. lappa L., great burdock, are introduced weeds of abandoned fields, roadsides, pastures and streambanks. The species are naturalized throughout much of southern Canada, especially in the eastern provinces, and the U.S.A. A summary of the biology of these two ruderal species is presented as part of a series of the biology of Canadian weeds.

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