Equisetaceae.—Horsetail family.

Botanical name: 
Equisetum hyemale

17. EQUISETUM.—SCOURING RUSH. The herb of Equise'tum hyema'le Linné. Habitat: Northern United States. Diuretic and astringent. Dose of fl'ext.: 15 to 60 drops (1 to 4 mils).

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