alyssum

n. madwort, plant of the mustard family that has leaves shaped like a spatula and clusters of white or yellow flowers

Alyssum is a genus of about 100-170 species of flowering plants in the family Brassicaceae, native to Europe, Asia, and northern Africa, with the highest species diversity in the Mediterranean region.The genus comprises annual and perennial herbaceous plants or (rarely) small shrubs, growing to 10-100 cm tall, with oblong-oval leaves and yellow or white flowers (pink to purple in a few species).The genus Lobularia is closely related to Alyssum and was formerly included in it. The widely cultivated species popularly known as "Sweet Alyssum" is Lobularia maritima.
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Noun
1. a genus of the family Cruciferae
(synonym) genus Alyssum
(hypernym) dilleniid dicot genus
(member-holonym) Cruciferae, family Cruciferae, Brassicaceae, family Brassicaceae, mustard family
(member-meronym) madwort

Noun
1. any garden plant of the genus Alyssum having clusters of small yellow or white flowers
(synonym) madwort
(hypernym) crucifer, cruciferous plant
(member-holonym) Alyssum, genus Alyssum

n. alyssum

(n.)
A genus of cruciferous plants; madwort. The sweet alyssum (A. maritimum), cultivated for bouquets, bears small, white, sweet-scented flowers.