Herbaceous, perennial plants of woodlands, often hanging from cliffs. Flowers single on long stems, with a distinctive shape, the 5 petals forming elongate, hollow, red spurs containing nectar; the 5 sepals are leaflike, attached between the petals, light yellow. The numerous stamens extend below the flower. Blooms April–July. Leaves: a few basal, the others cauline (along the stem), both on long petioles, 3-divided with deep lobes, bluish green.