Abstract:Knapweeds, Centaurea spp., are among the most successful grassland invaders in North America. Despite similar life histories, only certain members of this genus have become problem species, while others remain as benign, naturalized exotics. Two ideas which have been proposed to explain the success of exotic plants are the novel weapons (allelopathy) and enemy release hypotheses. In this study, both hypotheses were examined by comparing highly invasive knapweeds to their noninvasive kin. Leachates collected na… Show more
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