Senna tora (originally described by Linné as Cassia tora) is a legume in the subfamily Caesalpinioideae. Its name has been derived from Sinhala language, in which it is called Tora (තෝර). In Sri Lanka it is easily found in many places. It grows wild in most of the tropics and is considered a weed in many places; its native range is not well known but probably South Asia. It is often confused with Chinese senna or sicklepod, Senna obtusifolia. If it is given a distinct common name at all, it is called sickle wild sensitive-plant or sickle senna.