a tropical plant with a fruit that is often used to make a medicine to help your bowels work (sana). Any of several plants, especially of the genus Cassia, in the pea family (see legume), mostly of subtropical and tropical regions. Many are used medicinally; some yield tanbark used in preparing leather. Some sennas are among the showiest flowering trees. In the eastern U.S., wild sennas (C. hebecarpa and C. marilandica) grow up to 4 ft (1.25 m) high and have showy spikes of yellow flowers. Some species are Old World shrubs or small trees
The plants themselves, native to the East, but now cultivated largely in the south of Europe and in the West Indies
Any of several plants of the tribe Cassieae, especially those of the genera Cassia and Senna, whose leaves and pods are used as a purgative and laxative
The dried leaves or pods of these plants (especially of Cassia angustifolia or Cassia acutifolia) used medicinally