Erysimum asperum, the western wallflower (a name it shares with Erysimum capitatum), is a species of flowering plant in the family Brassicaceae. It is native to west-central Canada, the west-central United States, and northern Mexico; in grasslands generally east of the Continental Divide and west of the Mississippi. It is a member of the Erysimum asperum-E. capitatum species complex.