①Large-grained psyllium

It is the seed of psyllium. It is elliptic or irregularly oblong, slightly compressed, 2 millimeters long and 1 millimeter wide. Surface tan or black-brown. Observed under the magnifying glass, can be seen fine reticulation, the umbilicus light yellow, elliptical fovea. Odorless, chewing with mucus. To grain large, black color, full of the best.

Mainly produced in Jiangxi, Henan. In addition, the northeast, north, southwest and east China and other places are also produced.

②Small-grain plantain

For the flat plantain seeds. It is elliptic or irregularly oblong, slightly compressed, 1 to 1.5 millimeters long, less than 1 millimeter wide, and the rest is similar to the previous species.

Mainly produced in Heilongjiang, Liaoning, Hebei and other places. In addition, Shanxi, Inner Mongolia, Jilin, Shaanxi, Gansu, Qinghai, Shandong and other places also produced.