Erect shrub, may form thickets. Stem with few prickles. Prickles straight, with thick base, pair of thorns just at base of leaf. Leaves pinnately compound, with 5–9 hairless, glandless, toothed leaflets. Inflorescence consists of 2–10 flowers in clusters on hairless, glandless stalks. Sepals narrowly oval, coated with glands, smooth-edged tips nearly as long as petals. Pink flowers 1/2–3/4 in. across. Grows in moist or shady places from near sea level to near treeline.