Aspidosper'ma Quebra'cho-blan'co, Aspidosperma, Quebracho Bark. -- The dried bark with not more than 2 p.c. of wood or other foreign matter, U.S.P. 1890-1910; S. America, Argentine Republic, Chile. Evergreen tree, 25-30 M. (80-100 degrees) high, drooping branches; wood brownish; leaves lanceolate, small, coriaceous, rigid, glaucous; flowers campanulate, yellowish, 5's; fruit dehiscent capsule, pericarp thick, woody. Bark, in irregular pieces, 5-14 Cm. (2-6') long, 10-35 Mm. (2/5-1 2/5') thick, 2-layers -- outer corky, 3-25 Mm. (1/8-1') thick, reddish-brown, deeply furrowed, frequently reticulate with longitudinal and shallow transverse fissures; outer surface of bark (after removing cork) reddish-brown, rough, inner surface yellowish-brown, sometimes with adhering wood, striate, porous; fracture short, fibrous, revealing 2 well-defined strata of near equal thickness marked with dots, stone cells and striae; nearly inodorous; taste bitter, slightly aromatic. Powder, reddish-brown -- bast-fibers, crystal-fibers, stone cells, cork cells, starch grains; solvent: diluted alcohol; contains aspidospermine, aspidospermatine, aspidosamine (amorphous), quebrachine, quebrachimine, hypoquebrachine (amorphous), quebrachit (sugar), tannin 3-4 p.c. Cardiac and respiratory stimulant, slows and deepens breathing, antispasmodic, antiperiodic -- poisonous, death from asphyxia, solutions protective to wounds; cardiac and asthmatic dypsnea, phthisis, asthma from bronchitis or chronic pneumonia, shortness of breath. Dose, gr. 15-30 (1-2 Gm.); Fluidextract, Extract, Tincture, 20 p.c., Wine. Quebracho Colorado (Loxopteryg'ium Lorent'zii -- Red Quebracho). -- S. America, Bark checkered, wood red, light brown (Colorado); contains tannin 20 p.c., loxopterygine; resinous exudation of bark resembles kino; resembles aspidosperma but deeper color, largely used in tanning. Quebracho flo'ja (Iodi'na rhombifo'lia), S. America, and Copalchi Bark (Croton ni'vens), Mexico. All three collected and sold as aspidosperma.