hoary alyssum definition

  • noun:
    • a yearly European natural herb (Berteroa incana) associated with the mustard household, having silvery foliage, oblong fruits, and deeply notched white blossoms. It really is naturalized in eastern North America. Also called alyssum.
    • tall European annual with downy grey-green vegetation and heavy minds of little white blossoms followed by hairy pods; naturalized in united states; sometimes a troublesome grass
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