Aromatic herb; stem 30-200 cm, striate, glabrous, usually purple-spotted. Basal leaves up to 4-pinnate/ternate, with petiole up to 60 cm; ultimate segments elliptic, 0,5-1 cm, usually pinnatisect. Umbels 8-14-rayed, bracts and bracteoles 3-6, foliaceous, c. 3 mm. Mericarps c. 2,5 x 1,5 mm, ridges straight to ± sinuous and interrupted. Fl. 4-8. Woods and stream banks, more usually in man-made habitats near water, s.I.-2400 m.