sweet alyssum

noun
a garden plant, Lobularia maritima, of the mustard family, having narrow leaves and small, white or violet flowers.

Origin:
1825–35

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sweet alyssum
 
n
See also alyssum a Mediterranean plant, Lobularia maritima, having clusters of small fragrant white or violet flowers, that is widely grown in gardens: family Brassicaceae (crucifers)

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

sweet alyssum

(Lobularia maritima; Alyssum maritimum of some authorities), low, short-lived perennial herb of the mustard family (Brassicaceae), native to the Mediterranean region. Sweet alyssum is widely grown for its honey-sweet, small, clustered, white, four-petaled flowers. There are horticultural forms with lavender, pink, or purple flowers. The narrow, gray-green leaves are untoothed and usually bear many silvery hairs. The flowering stalks rise to 30 cm (1 foot), with the small, round seedpods developing on the stems below the flower heads.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The hoops are then underplanted with sweet alyssum, parsley, or violas.
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