Bidens coronata tick-seeded sunflower Asteraceae BICO2; Q, i; R, c;

   

Bidens coronata.Josh Sulman.Robert W. Freckmann Herbarium. University of Wisconson at Stevens point.wispalnts.uwsp.edu

Bidens coronata.Josh Sulman.Robert W. Freckmann Herbarium. University of Wisconsin at Stevens point.wisplants.uwsp.edu (Accessed5/2014).

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. 

Bidens coronata flower. Photo by Kim Hosen, Merrimac Farm, August 2008. Prince William Conservation Alliance. pwconserve.org

Bidens coronata flower. Photo by Kim Hosen, Merrimac Farm, August 2008. Prince William Alliance. pwconserve.org (Accessed 11/2017).

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. 

Origin: Native. 

Habitat: Open wet areas, roadside ditches, soil pH 5.2-7.1 (USDA 2006).