Cassia is a genus of flowering plants in the legume family, Fabaceae, and the subfamily Caesalpinioideae. It is a large genus of shrubs, trees, and herbs, consisting of over 500 species native to tropical and subtropical regions throughout the world. The leaves are pinnate and the flowers are bright yellow, pink, or white. The pods of some species are edible and are used as a food source in some parts of the world. Cassia is also used in herbal medicine for a variety of ailments.