cheiranthus cheiri(n = noun.plant) erysimum cheiri, wallflower - perennial of southern Europe having clusters of fragrant flowers of all colors especially yellow and orange; often naturalized on old walls or cliffs; sometimes placed in genus Erysimum;
is a kind of flower
is a member of cheiranthus, genus cheiranthus

cheiranthus, cheiranthus allionii, cheiranthus asperus, erysimum cheiri, genus cheiranthus