Purple rivet, a leguminous herb. Creeping plants, hard, coiled trees, long trees. It consists of three parts: thin leaves, small flowers, purple, and a string about 30 cm long; Petiole short; Rootstock stores nutrients underground and is oblate, similar to potato and white.

Its long rhizome grows year after year and accumulates at least 15 chemical elements, belonging to linear organic acids, flavonoids, glycosyl flavonoids, sterols and glycosyl sterols.

Violet rivet is a special product in Thailand, so the Thai government has very strict control over the cultivation and export of this plant. It can be said that it is difficult to obtain pure products of bright purple riveting or refined from it outside Thailand.

Extended data:

Yanzi rivets are characterized by vines winding around big trees and crawling upwards. A branch has three leaves. This kind of flower is yellow and orange and grows in an open place.

The long roots of plants are buried in the ground and are similar in shape to potatoes. This plant propagates through seeds and their separated roots. This plant grows in forests in northern Thailand and eastern Beppu.

References:

Baidu encyclopedia-Yan zi riveting