Senna, a laxative made from the leaves of certain species of cassia plants. The chief sources are the Alexandria senna, native to Egypt, and the Tinnevelly senna, native to Arabia but widely grown in India.
Legumes produce their fruit as a pod and generally possess nitrogen-fixing bacteria in nodules on their roots. Because of those bacteria, legumes increase soil's nitrogen content. Some examples of legumes are soybeans, peas and alfalfa.
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