Pini-Pini. Jatropha urens.

Botanical name: 

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.

The Dispensatory of the United States of America, 1918, was edited by Joseph P. Remington, Horatio C. Wood and others.