Erysimum, or Blister Cress, a genus of about 85 species of small annual or perennial plants. They bear four-petaled flowers, which may be yellow, orange, purple, or red, and are often fragrant. Erysimum is native to the cooler parts of Europe, Asia, and North America. The plant is cultivated in rock gardens for its showy flowers.
The genus Erysimum belongs to the mustard family, Cruciferae.