350. HYPERICUM.—ST. JOHN'S-WORT. The herb of Hype'ricum perfora'tum Linné. Habitat: Europe, Asia, and North America. The drug as it appears in market is composed of a mixture of oblong-ovate, pellucid-punctate leaves, thread-like branches, and less slender, brittle stems, with occasionally black-dotted flower petals, the whole having a greenish-brown appearance. Constituents: Resin, tannin, and a red coloring matter. Used as a stimulant, diuretic, and astringent. Dose: 30 to 60 gr. (2 to 4 Gm.).
A Manual of Organic Materia Medica and Pharmacognosy, 1917, was written by Lucius E. Sayre, B.S. Ph. M.