Herbs, shrubs, or trees, usually with an acrid, milky juice, which in some cases yields rubber. A volatile oil is found in the bark of a few species, and a fatty oil is found abundantly in the seeds of other plants, as tiglium and ricinus.
A Manual of Organic Materia Medica and Pharmacognosy, 1917, was written by Lucius E. Sayre, B.S. Ph. M.