Eupato'rium perfolia'tum, Eupatorium, Thoroughwort, Boneset, N.F. -- The dried leaves and flowering tops with not more than 10 p.c. of stems nor 2 p.c. of foreign organic matter; N. America, swamps, meadows, banks. Hairy perennial, .6-1.2 M. (2-4 degrees) high, branched at summit; usually more or less broken. Leaves opposite, the pair united at the base, 8-20 Cm. (3-8') long, 1.5-5 Cm. (3/5-2') broad, tapering from base to apex, crenate-serrate, rugosely-veined, green, gray-green, tomentose, resinous-dotted beneath; flower-heads corymbed, campanulate involucre of imbricated scales, flowers 10-15, tubular, yellowish-white florets, bristly pappus; odor faintly aromatic; taste strongly bitter. Powder, dark green -- multicellular non-glandular hairs, glandular hairs short-stalked, ellipsoidal pollen grains, hairs of pappus branched, tracheae spiral, fragments of leaf epidermis with elliptical stomata; fragments of achene pericarp having cells with brownish walls; fragments of stem tissue showing epidermal cells, parenchyma, non-lignified fibers, tracheae and pith parenchyma; numerous fragments of corolla tissue; solvents: diluted alcohol, water partially; contains eupatorin, volatile oil, resin, tannin, gum, sugar, yellow coloring matter, ash 10 p.c. Stimulant, tonic diaphoretic (diuretic); large doses emetic, aperient, antispasmodic, similar to chamomile; intermittents, rheumatism, influenza, bronchitis. Dose, 3ss-1 (2-4 Gm.); 1. Fluidextractum Eupatorii (diluted alcohol), dose, mxv-60 (1-4 cc.). Infusion, 5 p.c., 3j-2 (30-60 cc.); when cold -- tonic, when warm -- emetic, diaphoretic. E. Purpu'reum, Gravel Root, Queen of the Meadow. The root, U.S.P. 1820-1830; N. America, dry woods, meadows. Perennial herb, 1-2 M. (3-6 degrees) high, stem green, purplish, purple band at joints, 2.5 Cm. (1') broad; leaves petiolate, 3-6 in whorl, 20-25 Cm. (8-10') long, 10-12.5 Cm. (4-5') broad, downy beneath; flowers purple, whitish, corymbs; contains euparin; taste bitter, aromatic; astringent. E. Verbenafo'lium (teucrifo'lium), Wild Horehound, Rough Boneset. The herb, U.S.P. 1820-1830. Perennial hairy herb .6-2.5 M. (2-8 degrees) high -- low grounds; leaves ovate, oblong, truncate at base, toothed; flowers August, white, panicled corymb; considered by some only a variety of E. Perfoliatum -- all three possess similar properties. E. Capillifo'lium (foenicula'ceum), Dog-fennel, Hogweed; Virginia-Florida. Plant smooth, 1-3 M. (3-10 degrees) high; juice relieves pain from insect-bites.