6. Polyg'Onum Bistor'Ta, Bistort

Polyg'Onum Bistor'Ta, Bistort. Europe, Asia, N. America, in meadows. Produces an S-shaped rhizome, bent upon itself - bistorted, 5 Cm. (2') long, 15 Mm. (3/5') thick, flattened or channeled, upper side transversely striate, root-scars on under side, red-brown; contains tannin 20 p. c, starch, calcium oxalate; tonic, astringent. Dose, gr. 5-30 (.3-2 Gm.).