Bidens bipinnata is an annual erect herb with a height of 30- 100cm. Stems obtuse quadrangular, glabrous or sparsely pilose in upper part. The lower leaves of the stem are small, 3-lobed or undivided, and usually wither before flowering; The middle leaf has no pterygoid stalk, and it is 1.5-5cm long, appearing three times; Leaflets are usually 3 cells.
, rarely pinnately compound leaves, with 5(-7) lobules, elliptic or oval lobules on both sides, 2-4.5cm long and1.5-2.5cm wide, with sharp apex, nearly round or wide wedge-shaped base, sometimes oblique, not sparse, serrated edges, long terminal lobules, oblong or oval, and 3.5cm long. The first disputed inflorescence has a peduncle with a length of 1-6 cm (fruit period 3-10); 7-8 involucral bracts, strip spoon-shaped, external stipules lanceolate, internal strips lanceolate; 5-7 ligulate flowers, oval and obovate tongue, white, 5-8 mm long and 3.5-5 mm wide, with obtuse or notched tip; The disk flower is tubular, about 4.5 mm long, and the crown has 5 teeth. Achene is black, strip-shaped, 7-13mm long, with 3-4 spikes at the top, and1.5-2.5mm long with barbed hairs. [ 1]