madwort

noun

1. any garden plant of the genus Alyssum having clusters of small yellow or white flowers

   noun.plant

   Synonyms alyssum

   Source: WordNet 3.0

2. A genus of cruciferous plants (<i>Alyssum</i>) with white or yellow flowers and rounded pods. <i>A. maritimum</i> is the commonly cultivated sweet alyssum, a fragrant white-flowered annual.

   noun

   Source: webster1913