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DescriptionThis introduced biennial plant is 2-6' tall. During the 1st year of development, it consists of a rosette of basal leaves about 1-3' across. These basal leaves are up to 16" long and 4" across. They are lanceolate or narrowly ovate in outline, but their margins are pinnately lobed (pinnatifid), coarsely toothed, and ciliate. During the 2nd year of development, one or more tall flowering stalks emerge from the basal rosette. These stalks are stout, round or angular, and covered with white prickles. There are opposite leaves at intervals along the lower half of the stalks. These opposite leaves are smaller in size and have shallower lobes than the basal leaves, otherwise they are much the same. Their bases are perfoliate or strongly clasp the stalks.