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Siberian wall flower, Erysimum allionii, Cheiranthus allionii | showy erect biennial or short-lived perennial cultivated for its terminal racemes of orange-yellow flowers; showy erect biennial or short-lived perennial cultivated for its terminal racemes of orange-yellow flowers; sometimes placed in genus Cheiranthus ❲Cheiranthus allionii, Erysimum allionii❳ |