cheiranthus asperus(n = noun.plant) erysimum arkansanum, erysimum asperum, western wall flower - biennial or short-lived perennial prairie rocket having orange-yellow flowers; western North America to Minnesota and Kansas; sometimes placed in genus Cheiranthus;
is a kind of flower
is a member of erysimum, genus erysimum

cheiranthus, cheiranthus allionii, cheiranthus cheiri, genus cheiranthus