tall European annual with downy gray-green foliage and dense heads of small white flowers followed by hairy pods; naturalized in North America; sometimes a troublesome weed
An annual European herb (Berteroa incana) of the mustard family, having silvery foliage, oblong fruits, and deeply notched white flowers. It is naturalized in eastern North America. Also called alyssum
widely distributed Old World perennial naturalized in North America having finely hairy leaves and inconspicuous white fragrant flowers North American annual or biennial with long soft hairs on the leaves