Bidens coronata is an annual or biennial herb, 30 cm to 1.5 m tall.
Leaves opposite, to 15 cm, pinnately divided, 3-7 narrow, toothed segments, leaf stalks ca 1 cm.
Flowers bright yellow, showy, rays about 8, large, 1-2.5 cm long, disk yellow, 0.8-1.5 cm wide, anthers longer than disk flowers, purple-black, blooming and fruiting July-Oct.
Fruit dry 1-seeded achenes, flattened, with 2 horn-like awns. Seeds eaten by birds, plants eaten by rabbits (Martin et al. 1951).
Wetland status: OBL.
Frequency in NYC: Very infrequent.
Habitat: Open wet areas, roadside ditches, soil pH 5.2-7.1 (USDA 2006).