Ru'mex cris'pus, or R. obtusifo'lius, Rumex, Yellow (Curled) Dock, N.F. -- The dried root with not more than 5 p.c. of stem-bases or other foreign organic matter; Europe, N. America. Common obnoxious weeds, 30-120 Cm. (1-4 degrees) high, coarsely angled; leaves (lower) 15-35 Cm. (6-14') long, decreasing toward summit, lanceolate, crisped, wavy; flowers terminal panicle becoming a dense mass of rusty-brown 3-winged capsules. Root, nearly simple, few rootlets, somewhat twisted, up to 30 Cm. (12') long, 7 Cm. (3') thick, reddish-brown, grayish from adhering soil, annulate above, wrinkled longitudinally, indented root-scars, stem-scars or remains (hollow); fracture short, dusty, fibrous; usually split longitudinally or cut transversely, 2 Cm. (4/5') long; odor slight; taste astringent, bitter. Powder, brownish--calcium oxalate rosettes, crystals, numerous starch grains, few fibers, tracheae, cork cells light brown; contains (cascara-) emodin .17 p.c., chrysophanic acid (rumicin, lapathin), tannin, calcium oxalate, starch. Astringent, alterative, tonic, laxative, antiscorbutic; similar to rhubarb and sarsaparilla; cutaneous eruptions, scorbutic manifestations, itch, scrofula, syphilis, hepatic congestion, dyspepsia, intermittents; leaves used as a laxative diet, and as spinach. Dose, gr. 15-60 (1-4 Gm.); 1. Fluidextractum Rumicis (diluted alcohol), dose, mxv-60 1-4 cc.). Decoction; Ointment.

R. britan'nica, Water Dock. The root, U.S.P. 1820-1850. Europe, naturalized in N. America. Plant 1.6-2 M. (5-6 degrees) high, leaves lanceolate, acute, transversely veined, obscurely crenate, .3-.6 M. (1-2 degrees) long; root more astringent but physically and medicinally similar to R. crispus, with which it is often indiscrimanately collected. R. sanguin'eus, Red-veined Dock. Leaf-veins and stems reddish; R. aqua'ticus, fruit smooth, both astringent. R.Acetosel'la, Field or Sheep Sorrel, contains acid potassium oxalate and tartaric acid, sour taste lost upon drying; refrigerant, diuretic, good diet in scurvy.