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New or Noteworthy Species of Draba (Brassicaceae) from Canada and Alaska

Abstract. 
 Seven new species of Draba are described and illustrated, and their relationships and distinguishing characters from nearest relatives are discussed. Of these, D. caswellii, D. cayouettei, D.franktonii, D.puvirnituqii, and D. taylori are described from Canada, D. healyi from Alaska, and D. bennettii from both. The new combination D. thompsonii is proposed, and the status of D. chamissonis in North America is confirmed. Draba paysonii is reported herein for the first time from Canada, and its previous reports from the country were shown to be based on misidentified plants of D. novolympica. Draba pycnosperma is recognized as a distinct species from Newfoundland and Québec, and its distinguishing characters from D. glabella, under which it was previously synonymized, are discussed. Draba mulliganii is reported as new to Canada, D. porsildii to Northwest Territories, and D. thompsonii to Yukon Territory. The ten Draba species added in this study bring the total in Canada and Alaska to 58, and a key to all these species is presented.