Semen Cuscutae is distributed in Heilongjiang, Jilin, Liaoning, Hebei, Shanxi, Shaanxi, Ningxia, Gansu, Inner Mongolia, Xinjiang, Shandong, Jiangsu, Anhui, Henan, Zhejiang, Fujian, Sichuan, Yunnan, Guangdong and other provinces in China. Iran and Afghanistan are also located in Japan and Korea in the east, and Sri Lanka, Madagascar, Australia and Africa in the south.

Cuscuta chinensis is born in fields, roadside wasteland, bushes and sunny slopes. Distributed in most parts of the country, mainly in the north. Cuscuta chinensis is round or oval, with obvious ventral branches, and both sides are often depressed. The major diameter is 1.4- 1.6 mm, and the minor diameter is 0.9- 1. 1 mm.

The surface is grayish brown or yellowish brown, slightly rough, and the beak is not obvious; Under the magnifying glass, you can see that there are fine dark spots and uneven white filiform stripes on the surface; The hilum is nearly round and located at the top of the seed.

The seed coat is hard and not easy to break. Soaked in boiling water, the surface is sticky. When cooking, the seed coat splits, revealing a yellow-white slender spiral embryo called "spinning". After removing the seed coat, you can see that the embryo is coiled around the center for 3 weeks, and the endosperm is membrane-like and sheathed around the embryo. Slight breath, slightly bitter and astringent taste.

Introduction of Cuscuta chinensis

Cuscuta chinensis (scientific name: Cuscuta chinensis? Lamentations of Jeremiah), alias bean parasitic, yellow silk, yellow silk vine, golden silk vine, etc. It belongs to Cuscuta of Convolvulaceae. Annual parasitic herbs. Stems twining, yellow, slender, leafless. Inflorescence lateral; Calyx cup-shaped, lobes triangular; Corolla white, pot-shaped; Stamens inserted below corolla lobes slightly curved; Ovary subglobose, style.