Cassia Seed (Cassia tora Linn) Source and Collection
It is the ripe seed of Cassia obtusifolia L. or C. tora., family Leguminosae. Its producing areas are mainly in the provinces of Jiangsu, Anhui, Guangxi, and Sichuan, etc., the medicinal material is collected in autumn when the legumes become yellowish-brown. Cut the whole plant, dried in the sun and get the seeds, remove impurities, the crude or the stir-baked one can be used as medication.