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This summary of biological information on heart-podded hoary cress (Cardaria draba (L.) Desv.), lens-podded hoary cress (C. chalepensis (L.) Handel-Mazzetti), and globe-podded hoary cress (C. pubescens (C. A. Meyer) Jarmolenko) is the third in a series of contributions on plants that are weedy in Canada. The hoary cresses are weedy in open habitats, particularly in the Prairie Provinces and the interior of British Columbia.

THE BIOLOGY OF CANADIAN WEEDS. 3. CARDARIA DRABA, C. CHALEPENSIS, AND C. PUBESCENS