The term 'PLANT USED IN HERBAL REMEDIES' can be summarized by the crossword solution 'SENNA' (5 letters). SENNA is a genus of flowering plants in the legume family, Fabaceae, and is native to tropical and subtropical regions of the world. It has been used for centuries in traditional medicine as a laxative, diuretic, and purgative. It is also used in herbal remedies for a variety of ailments, including constipation, digestive issues, and skin conditions.