Botanical name: 

CHEIRANTHUS, L. Wallflower. Several species cultivated, sweet scented nervine. The Ch. asper, N. of the West, is called Bitter root by the Indians, intensely bitter, and used by them as a tonic.

Medical Flora, or Manual of the Medical Botany of the United States of North America, Vol. 2, 1830, was written by C. S. Rafinesque.