Scientific name: Bidens biternata (Lour.) Merr. et Sherf.

Annual herb. Stem erect, 30-150 cm tall, slightly quadrangular, hairless or sparsely curly pubescent, 1-9 mm in diameter at base.

The leaves are pinnately compound, and the terminal leaflets are ovate to oblong-ovate or ovate-lanceolate, 2-7 cm long, 1-2.5 cm wide, apex acuminate, base Wedge-shaped, with slightly dense and nearly uniform serrations on the edge, sometimes one side is deeply divided into a small lobe, both sides are pubescent, 1-2 pairs of lateral leaflets, ovate or ovate-oblong, one near the top Slightly smaller, usually undivided, with the base extending downward, sessile or with short stalks, the lower pair about the same size as the terminal leaflets, with obvious stalks, with three compound leaves divided or with only one lobe on one side. Oval, with serrated edges; petioles 1.5-5 cm long, glabrous or sparsely pubescent.

The diameter of the flower head is 7-10 mm, the peduncle is 1.5-5.5 cm long, and the fruit is 4.5-11 cm long. The base of the involucre is pubescent, the outer bracts are 8-10, herbaceous, strip-shaped, 3-6.5 mm long, the apex is sharp, the back is densely pubescent, and the inner bracts are oblong or oblong. Lanceolate, 5-6 mm long, brown on the back, with dark vertical stripes, and pubescent.

There are usually 3-5 ligular flowers, sterile, the tongue is light yellow, oblong, about 4 mm long, 2.5-3 mm wide, with a 3-toothed apex, or sometimes no ligular flowers. ; Disk flower tube shape, 4-5.5 mm long, crown eaves with 5 teeth.

Achenes are strip-shaped, black, 9-19 mm long, 1 mm wide, four-sided, slightly narrow at both ends, more or less covered with small setae, 3-4 thorns on the top, 3-4 mm long , with barbed hairs.

Produced in South China, East China, Central China, Southwest China, Hebei, Shanxi, Liaoning and other places. Born on roadsides, beside villages and in wastelands. It is distributed in North Korea, Japan, Southeast Asian countries, Africa, and Oceania.

The whole plant is used as medicine. It has the effects of clearing heat, detoxifying, dispersing blood stasis and activating blood circulation. It is mainly used to treat upper respiratory tract infection, sore throat, acute appendicitis, acute jaundice hepatitis, gastroenteritis, rheumatic joint pain, and malaria. It is used externally to treat Boils, snake bites, swelling and pain from bruises. ? (Excerpted from "Flora of China")