ERYSIMUM Blistercress (Fairy Wall flower) (Derived from the Greek words to draw blisters) Closely related to the Wallflower, the Afghan Blistercress, Erysimum perofskianum, bears most brilliant orange flowers in lengthening terminal racemes. Especially admirable are these annuals in late Summer, when some other subjects are beginning to wane in beauty. E. asperum (arkansanum) is a lighter colored species, usually perennial […]