Source : WordNet®

true senna
     n : erect shrub having racemes of tawny yellow flowers; the
         dried leaves are used medicinally as a cathartic;
         sometimes placed in genus Cassia [syn: {Alexandria senna},
          {Alexandrian senna}, {tinnevelly senna}, {Indian senna},
          {Senna alexandrina}, {Cassia acutifolia}, {Cassia
         augustifolia}]