Coreopsis biternata Loureiro, Fl. Cochinch. 2: 508. 1790; Bidens chinensis Willdenow; B. robertianifolia H. Léveillé & Vaniot.

Annuals. Stems erect, 30-150 cm tall, subtetragonal, loosely crisp pilose, branched in upper portion. Leaves cauline; median leaves opposite, petiole 3-5 cm, blade 9-15 cm, prominently soft pubescent on both surfaces, once or twice divided into pinnate leaflets, terminal segment ovate, shortly acuminate, rather prominently toothed, lateral segments ovate, sometimes lower one pinnatifid; upper leaves gradually smaller, opposite or alternate, bipinnately parted. Capitula radiate or discoid, 7-10 mm in diam.; peduncle 1.5-5.5 cm; phyllaries 8-10, 1-seriate, herbaceous, linear, 3-6.5 mm, acute; outer chaff calycular bracts 5-6 mm, margin hyaline. Ray florets 0-5, sterile; lamina yellow, ca. 5.5 × 2.5-3 mm, tube 1.2-1.5 mm. Disk florets bisexual, fertile; corolla 4-5.5 mm, tube 1.2-2 mm. Achenes linear, 9-19 × ca. 1 mm, compressed, 4-angled, shortly strigose; pappus awns 3 or 4, 3-4 mm. Fl. Sep-Nov.

Roadsides, waste fields; below 1300 m. Anhui, Fujian, Gansu, Guangdong, Guangxi, Guizhou, Hainan, Hebei, Henan, Hubei, Hunan, Jiangxi, Liaoning, Shaanxi, Shandong, Shanxi, Taiwan, Yunnan, Zhejiang [Africa, Asia, Oceania].