Wallflower
the common name of the species of plants belonging to the genus Cheiranthus, natural order Cruciferæ. They are biennial or perennial herbs or undershrubs. Many of them exhale a delicious odor, and are great favorites in gardens. The best known is the C. Cheiri, or common wallflower, which, in its wild state, grows on old walls and stony places. In the cultivated plants the flowers are of more varied and brilliant colors, and attain a much larger size than in the wild plant, the flowers of which are always yellow.