Myri'ca cerif'era, or M. Carolinen'sis, Myrica, Bayberry Bark, Wax Myrtle Bark, N.F. -- Myricaceae. The dried bark of the root with not more than 5 p.c. of adhering wood or other foreign organic matter; S. United States; dry woods, fields. Dense evergreen shrub, 1.5-3 M. (4.5-9 degrees) high, grayish; leaves oblong, entire, fragrant dark green; flowers, staminate -- yellow catkins, pistillate -- greenish aments; fruit, bluish-white drupes, waxy. Bark (root) in transversely curved pieces, strips, quills, varying length, up to 20 Mm. (4/5') broad, 1-2.5 Mm. (1/25-1/10') thick, rarely 5 Mm. (1/5' -- aerial stem), grayish, brownish, scaly, occasional warts lenticels, inner surface brownish, striated; fracture short, weak, uneven; odor characteristic; taste astringent, bitter, acrid. Powder, reddish-brown -- numerous starch grains, calcium oxalate crystals, lignified fibers, stone cells, gummy lignin, few tracheae; contains resins myricinic acid, tannin, red coloring, fat, gum, starch. Alterative, cholagogue, diuretic, sialagogue, astringent, tonic; diarrhea, scrofula, jaundice. Dose, gr. 5-30 (.3-2 Gm.); 1. Pulvis Myricae Compositus, Composition Powder, 60 p.c. + ginger 30, capsicum 5, clove 5 -- stimulant, carminative. Dose, gr. 10-20 (.6-1.3 Gm.). Extract, gr. 5 (.3 Gm.).