Botanical name: Erysimum hieraciifolium Family: Brassicaceae (Mustard family)
European Wallflower is a biennial to perennial herb, 1-3 ft tall, erect, hairy. Stem is often simple, somewhat angular, rarely branched. Basal leaves are ina rosette rosulate, very variable, elliptic-oblong to inverted-lanceshaped, stalked, 4-6 cm long, 3-10 mm broad, sparsely toothed to nearly entire. Stem leaves are similar to basal leaves or linear, stalkless, or nearly so. Flowers are borne in 20-60-flowered racemes, up to 40 cm long in fruit. Flowers are about 1 cm across, yellow. A related species Himalayan Wallflower has larger flowers. Flower-stalks are 6-10 mm long, ascending. Sepals are 5-6 mm long. Petals 8-10 mm long, 3-3.5 mm broad, long-clawed. Stamens are 5-7 mm long, anthers about 2 mm long. Seed-pods are linear-round, erect, 3-6 cm long, 1.5 mm broad, appressedly hairy; valves with a distinct mid-rib; style 0.5-1.5 mm long with capitate, bilobed stigma. Flowering: May-July.
Identification credit: Gurcharan Singh
The flower labeled European Wallflower is ...