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western wall flower, Erysimum asperum, Cheiranthus asperus, Erysimum arkansanum | biennial or short-lived perennial prairie rocket having orange-yellow flowers; western North America to Minnesota and Kansas; biennial or short-lived perennial prairie rocket having orange-yellow flowers; western North America to Minnesota and Kansas; sometimes placed in genus Cheiranthus ❲Cheiranthus asperus, Erysimum asperum, Erysimum arkansanum❳ |