Cassia seed: It is a leguminous plant, the dried and mature seed of Cassia cassia. The mature fruit is harvested in autumn, dried in the sun, and the seeds are laid to remove impurities. Cassia seed is also called cassia seed, sheep's goat's horn, horseshoe cassia seed, Huantong seed, fake mung bean, horseshoe seed, celery seed, croissant and wild green bean. It tastes bitter, sweet and cool, and has the effects of clearing liver fire, expelling wind and dampness, improving eyesight, moistening intestines and relaxing bowels. Commonly known as: wild flowers, yellow flowers, fruit for slender pods.

The difference between cassia seed and pig excrement bean is that the leaf pair of cassia seed is pinnate and the fruit is slender and pods; The leaves of Crotalaria pigmentosa are in a feather shape, and its fruit is a cylindrical pod, which is thicker and shorter than that of Cassia seed, so we should pay attention to the difference.