Bidens leptocephala Sherff

Annuals, 10–25(–50) cm. Leaves: petioles 5–40 mm (usually hispido-ciliate); blades rounded-deltate overall, 15–50+ × 12–40+ mm, 1–2-pinnatisect, ultimate lobes ovate or lanceolate to linear, 3–25+ × (1–)2–3(–15) mm, bases ± cuneate, ultimate margins entire, ciliolate, apices acute to attenuate, faces glabrous or hirtellous. Heads usually borne singly, sometimes in open, ± corymbiform arrays. Peduncles (10–)30–80+ mm. Calyculi of 3–4(–6) ± appressed, subulate to filiform bractlets 1–3 mm, margins ciliolate, abaxial faces usually glabrous. Involucres ± cylindric, 2–3(–4+) × 1.5–2+ mm. Phyllaries 4–5(–7), oblong to lanceolate, (2–)3–4+ mm. Ray florets 0 or 2–3; laminae yellowish or whitish, 1–3 mm. Disc florets 5–13; corollas yellowish to whitish, 1.5–2 mm. Cypselae: outer red-brown, flat or unequally 4-angled, linear, 6–8 mm, margins not ciliate, apices somewhat attenuate, faces obscurely 2-grooved, antrorsely hispidulous toward tips; inner similar, blackish (sometimes with pale tips), ± equally 4-angled, linear-fusiform, 9–14 mm, margins not ciliate, apices attenuate, faces 2-grooved, antrorsely hispidulous (at least distally); pappi of 2(–3), erect, retrorsely barbed awns 1–3 mm.

Bidens leptocephala, the fewflower beggarticks, is a North American species of flowering plant in the family Asteraceae. It is native to the southwestern United States (Arizona, New Mexico, western Texas) and northern Mexico (Chihuahua, Sonora, Baja California, Baja California Sur).

Bidens leptocephala is an annual herb up to 50 cm (20 inches) tall. Flower heads are sometimes borne one at a time, sometimes in groups of 2 or 3, each head yellow or white with disc florets and sometimes with ray florets. The species usually grows on streambanks.

Bidens leptocephala là một loài thực vật có hoa trong họ Cúc. Loài này được Sherff mô tả khoa học đầu tiên năm 1917.