23. Aristolochiaceae.—Birthwort family.

Climbing shrubs, or low herbs, with perfect flowers, the lurid calyx coherent, with the ovary, which forms a 6-celled capsule or berry in fruit. Leaves petiolate. Principal constituents are volatile oil and resinous principles.

A Manual of Organic Materia Medica and Pharmacognosy, 1917, was written by Lucius E. Sayre, B.S. Ph. M.