Ascle'pias tubero'sa, Asclepias, Pleurisy Root, N.F. -- Asclepiadaceae. The dried root with not more than 5 p.c. of foreign organic matter; United States, Canada. Perennial plant with numerous stems .6-1 M. (2-3 degrees) high, hairy, green or reddish, differing from other asclepiades in not emitting milky juice; flowers beautiful orange-red. Root, irregularly fusiform, 10-20 Cm (4-8') long, .5-5 Cm. (1/5-2') thick, occasionally branched, usually in pieces; orange-brown, annulate above, numerous intersecting grooves; bark thin; fracture tough, granular and white, yellowish wood bundles and medullary rays; odor slight; taste bitterish, disagreeable, acrid. Powder, yellowish-brown -- many starch grains, calcium oxalate rosettes, abundant parenchyma cells, many filled with starch grains; stone cells, tracheae, bordered pores, few fibers; solvent: diluted alcohol; contains asclepiadin--the active glucoside, volatile oil,, 2 resins, mucilage, starch, tannin, ash 9 p.c. Diaphoretic, expectorant, carminative, sudorific, anodyne, irritant, large doses emetic, cathartic; pleurisy (hence name), pneumonia, consumption, rheumatism of chest, colic, dyspepsia, asthma, scrofula, ulcers, wounds. Dose, gr. 15-30 (1-2 Gm.); 1. Fluidextractum Asclepiadis (diluted alcohol), dose, 3ss-1 (2-4 cc.).