24. Polygoneae.—Buckwheat Family.

Herbs or woody plants with alternate, entire leaves, and with the stipules in the form of sheaths above the smaller joints of the stem. Fruit an akene. The leaves and stem are very rich in crystals of calcium oxalate.

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