alyssum əlĭs´əm [key], any species of the genus Alyssum of the family Cruciferae (or Brassicaceae; mustard family), annual and perennial herbs native to the Mediterranean area. A few species, notably the perennial golden tuft ( A. saxatile ), are cultivated as rock-garden or border ornamentals for their masses of yellow or white flowers. The annual sweet alyssum (called A. maritima but separated by most botanists as Lobularia maritima ) is a similar plant with fragrant white or lilac blossoms. The alyssums have been called madwort or heal-bite because of an old belief that they cured rabies. Alyssum is classified in the division Magnoliophyta , class Magnoliopsida, order Capparales (or Brassicales), family Cruciferae (or Brassicaceae).

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