| Noun | 1. | genus Senna - genus of shrubs and trees and herbs many of which are often classified as members of the genus Cassia rosid dicot genus - a genus of dicotyledonous plants Caesalpinioideae, subfamily Caesalpinioideae - alternative name in some classification systems for the family Caesalpiniaceae senna - any of various plants of the genus Senna having pinnately compound leaves and showy usually yellow flowers; many are used medicinally Cassia marilandica, Senna marilandica, wild senna - North American perennial herb; leaves are used medicinally; sometimes placed in genus Cassia Cassia tora, Senna obtusifolia, sicklepod - cosmopolitan tropical herb or subshrub with yellow flowers and slender curved pods; a weed; sometimes placed in genus Cassia |