WordNet (r) 3.0 (2006):

Cheiranthus asperus
    n 1: biennial or short-lived perennial prairie rocket having
         orange-yellow flowers; western North America to Minnesota
         and Kansas; sometimes placed in genus Cheiranthus [syn:
         western wall flower, Erysimum asperum, Cheiranthus
         asperus, Erysimum arkansanum]