Cop'tis trifo'lia, Coptis, Goldthread, N.F. -- The dried plant with not more than 3 p.c. of foreign organic matter; N. America, damp, mossy woods. Plant with scape 7.5-12.5 Cm. (3-5') high, leaves radical, 3-foliate; evergreen, obovate-cuneate, coriaceous, flowers May, whitish; fruit 7 follicles, seed black. Rhizome, in loose, matted masses (rhizome, roots, leaves), golden-yellow; odor faint; taste bitter without astringency. Powder, yellowish-green--starch grains, elliptical stomata, chloroplastids, root cells with reddish contents, tracheae; contains berberine, coptine (white, possibly identical with hydrastine), resin, ash 8 p.c. Masticatory; mouth wash for canker-sores, gargle for sore throat, ulcerated mouth. Dose, gr. 15-60 (1-4 Gm.); 1. Fluidextractum Coptis (diluted alcohol). Tincture, 10 p.c.; Infusion, Decoction, 5 p.c.