540. Viburnum Opulus, N.F.—Cramp Bark. High Bush Cranberry.

Botanical name: 

Fig. 234. Viburnum opulus. The dried bark of Vibur'num op'ulus Linné

HABITAT.—North America.

Fig. 235. Cross-section of bark of Viburnum opulus... Fig. 235 a. - Viburnum opulus DESCRIPTION OF DRUG.—Very thin pieces or occasionally quills, outer surface, light gray, with purplish-brown stripes and very small brown lenticels; thicker pieces purplish-red, or occasionally blackish; odor strong and characteristic; taste bitter; the inner surface is yellowish or brownish; fracture short. The bark of the mountain maple (Acer Spicatum) was an adulterant formerly described by misled authorities, as Viburnum opulus.

Powder.—Light brown. Characteristic elements: Parenchyma of inner cortex, with rosettes of calcium oxalate; middle bark bearing reddish-brown coloring matter, starch (5 to 12 µ in diam.); tracheal fragments with lignified wood fibers; few stone cells; crystals of calcium oxalate, few aggregate (15 to 30 µ in diam.); polygonal cork cells, thin-walled.

ACTION AND USES.—Claimed to be antispasmodic, hence the name cramp bark. Dose: 30 gr. to 2 dr. (2 to 8 Gm.).

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