Angelica atropurpurea is a perennial herb, taprooted, stout, stem solitary, hollow, ca 1.5 m tall, 3 cm diameter at base, purplish or purple-blotched.
Leaves alternate, pinnately compound, basal leaves ca. 20 cm long, often twice compound, 5-7 leaflets about 6 cm long, egg-shaped to lanceolate, margin toothed, small veins extend to tips of teeth, leaves progressively reduced upwards, petioles, conspicuously veined, inflated, sheathing, to 5 cm wide with prominent veins.
Flowers white to greenish, small, inflorescence ca 15 cm wide, umbrella shaped (compound umbel) with ca 30 rays June- Aug.
Fruit dry, ca 1 cm, winged, July-Oct.
Wetland status: OBL.
Frequency in NYC: Very infrequent.
Habitat: Open marshes, wet edges. Apiaceae of open sites are eaten by larvae of the black swallowtail butterfly, Papilio polyxenes (Papilionidae); (Tallamy 2003; Pyle 1981).