Pini-Pini. Jatropha urens.
Pini-Pini. Arra Diabo.—This is the bark of Jatropha urens (Fam. Euphorbiaceae).—This Brazilian plant has been long used by the natives of Southern America as a blistering agent. Very little is known of its constituents and it is but lately that it has come into notice as a caustic and blistering medium.