Note: Do not rely on this information. It is very old.
Wallflower (Cheiranthus Cheiri), a cruciferous plant native to southern Europe and growing commonly as an escape from cultivation on ruins, old walls, and sea-cliffs in England. It is a herbaceous perennial, pubescent, with adpressed bifid hairs; has entire lanceolate-acute leaves, corymbosely racemose flowers with long claws and large spreading limbs to the petals and pouches to the two lateral erect sepals. The siliqua is four-angled, the stigma sub-sessile, the seeds uniseriate and compresed, and the cotyledons accumbent.