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'''Strychnos''' is a genus of flowering plants, belonging to family Loganiaceae (sometimes Strychnaceae). The genus includes about 190 species of trees and lianas, distributed around the world's tropics.

★ The Strychnine tree, ''Strychnos nux-vomica'', native to tropical Asia, is the source of the poison strychnine.

★ The species ''Strychnos toxifera'' is one of the 2 plant sources of the poison curare.

★ Another notable species is ''Strychnos spinosa'' (Lam.), commonly known as the Natal orange.

★ The ripe seeds of ''Strychnos potatorum,''[1][2], known as Therran or Nirmal,[3] can be ground and used as a coagulant to purify water; or they may be rubbed against the inside walls of the earthenware water containers.

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★ This plant can purify water

★ Home water treatment by direct filtration with natural coagulant, by Babu R, Chaudhuri M.