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The Sicklepod (Cassia obtusifolia) belongs to the family Caesalpiniaceae. It is an annual herb that is native from southeastern United States to Central America and the tropical areas of South America. This herb grows in coastal plains to hillsides, and can reach 1-2 m in height. It was introduced into Japan via China as a medical herb in Edo Era (1603-1868). The leaves are pari-pinnate compound with obovate leaflets. The peduncles are borne on the axils, and the yellow flowers bloom August to September. The fruits are arched pods, about 15 cm long. The seeds are called "ketsumei-shi", and used as a herbal medicine for laxative, and a basic ingredient of herbal tea. "Habu-cha" is made by roasting the seeds and then brewing them. It has a nutty aroma and a subtle sweetness, and is said to have relaxing effects, support eye health, and help relieve constipation.
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