Huanghuai (scientific name: Senna surattensis (Burm.f.) H.S. Irwin et Barnaby) is a cassia plant. Small deciduous trees or shrubs. Feather compound leaves, obovate-elliptic, with rounded apex. The base is slightly inclined; There is a rod-shaped gland between two or three pairs of leaflets at the lower part of the leaf axis. Flowers are large and bright yellow, sometimes shrinking slightly between seeds. It blooms almost all year round, but mainly from March to 65438+February. Tropical Asia to Oceania. Love the light and need deep and well-drained soil. (Overview and picture reference source 123 1)