Erysimum collisparsum

Erysimum collisparsum is a wallflower in the mustard family Brassicaceae, a regional species described from temperate Eurasia. Like other members of the genus it is a biennial or short-lived perennial herb forming a basal rosette of narrow lanceolate to oblanceolate leaves and producing erect terminal racemes of four-petaled flowers in shades of yellow to orange in spring and early summer. The fruit is an elongate four-angled silique containing rows of small flat seeds. Members of the genus characteristically contain mustard oil glucosides and cardenolides and occupy dry rocky slopes, steppe and disturbed open ground. The species is poorly documented in English-language botanical literature and lacks a dedicated Wikipedia article; it is treated regionally within local floras of its native range.