THE BIOLOGY OF CANADIAN WEEDS.: 62. Lappula squarrosa (Retz.) Dumort.

This summary of biological information of Lappula squarrosa (Retz.) Dumort (bluebur) is part of a series on the biology of Canadian Weeds. Lappula squarrosa is a weed of disturbed areas and cultivated fields throughout Canada. It is especially abundant in the Prairie and Parkland regions.Key words: Weed biology, Lappula squarrosa, bluebur, bardanette