hoary alyssum

Từ điển WordNet v3.1 - WordNet Dictionary

noun

tall European annual with downy grey-green foliage and dense heads of small white flowers followed by hairy pods;
naturalized in North America;
sometimes a troublesome weed
• Syn:
hoary alison, Berteroa incana
• Hypernyms:
herb, herbaceous plant
• Member Holonyms:
Berteroa, genus Berteroa