Senna is a plant from hot parts of the world. People dry the leaves and the little pods and use them as a medicine to make the bowel move — to help you go to the toilet when you are stuck. You will see it in a pharmacy, sometimes as tea, sometimes as tablets. It is a real drug, not a gentle food: take too much and your stomach can cramp. This entry is the plant. The famous family name Senna is a different word, borrowed from Italian, not from this plant.

番瀉葉（用來通便的藥草；藥房常見）。