Tur'nera diffu'sa, or T. Aphrodisi'aca, Damia'na, Turnera, N.F. -- Turneraceae. The dried leaf with not more than 15 p.c. of stems nor 3 p.c. of other foreign organic matter, yielding not more than 4 p.c. of acid-insoluble ash; W. Mexico, S. California, Texas. Leaves obovate, 10-25 Mm. (2/5-l') long, 4-10 Mm. (1/6-2/5') broad, short-petioled, acute, cuneate base, 2-10-toothed on each side, smooth, light green; lower surface densely tomentose (T. diffusa), or glabrous, with few hairs on ribs (T. aphrodisiaca); frequently some reddish twigs; flowers yellowish, globose pods; odor aromatic; taste characteristic, aromatic, resinous. Powder, yellowish-green -- stomata, hairs, tracheae, few tracheids from stem, calcium oxalate crystals in rosettes or prisms, starch grains; solvent: diluted alcohol; contains volatile oil (amber-colored, aromatic odor, warm camphoraceous taste) .5 p.c., damianin (bitter principle), 2 resins 6.4 p.c., tannin 3.5 p.c., starch, ash 10 p.c. Aphrodisiac, tonic, stimulant, laxative; sexual impotence, in conjunction with strychnine, phosphorus. Dose, 3ss-2 (2-8 Gm.); 1. Fluidextractum Damianae (75 p.c. alcohol), dose, 3ss-2 (2-8 cc.); Infusion -- substitute for tea.