Noun | 1. | ![]() genus Senna - genus of shrubs and trees and herbs many of which are often classified as members of the genus Cassia Cassia alata, ringworm bush, ringworm cassia, ringworm shrub, Senna alata - tropical shrub (especially of Americas) having yellow flowers and large leaves whose juice is used as a cure for ringworm and poisonous bites; sometimes placed in genus Cassia avaram, Cassia auriculata, Senna auriculata, tanner's cassia - evergreen Indian shrub with vivid yellow flowers whose bark is used in tanning; sometimes placed in genus Cassia Alexandria senna, Alexandrian senna, Cassia acutifolia, Cassia augustifolia, Indian senna, Senna alexandrina, tinnevelly senna, true senna - erect shrub having racemes of tawny yellow flowers; the dried leaves are used medicinally as a cathartic; sometimes placed in genus Cassia Cassia occidentalis, coffee senna, mogdad coffee, Senna occidentalis, stinking weed, styptic weed - very leafy malodorous tropical weedy shrub whose seeds have been used as an adulterant for coffee; sometimes classified in genus Cassia |