Herbs, shrubs, or trees. mostly tropical, with a milky juice which is often drastic or poisonous. Leaves mostly opposite, exstipulate. Flowers regular, 5-merous and 5-androus, with the pollen cohering into granular, waxy masses. Fruit a pair of follicles; seeds often comose.
A Manual of Organic Materia Medica and Pharmacognosy, 1917, was written by Lucius E. Sayre, B.S. Ph. M.