Country of origin
This product is 50 ~ 100cm long, the whole body is white and soft. Stem cylindrical lower part, 4 ~ 6mm in diameter, reddish-brown, square cylindrical upper part, slightly depressed on all sides, greenish-brown, longitudinal sulcus and ridge, knobby.
In summer and autumn, when the stems and leaves are lush, they are cut, removed impurities, and dried.
Leaf blades of 2 sizes, alternate on leaf axis, apical leaflet larger, intact small leaf blade flattened to ovoid or long oval, apex pointed, base cuneate, margin serrated.