Oenothera laciniata is an annual herb, to 40 cm tall.
Leaves alternate, to 8 cm long, narrow, margin wavy-toothed, to pinnately divided, green, sparsely hairy, tapered to base.
Flowers yellow, petals to 1.8 cm long, May-Oct.
Fruit a linear capsule to 3.5 cm long.
Wetland status: FACU-.
Frequency in NYC: Very infrequent (NYS rare, S1, E).
Habitat: Dry sandy soil. Seen once on White Island.