This section is from the book "Materia Medica Pharmacy, Pharmacology And Therapeutics", by W. Hale White. Also available from Amazon: Materia Medica Pharmacy, Pharmacology And Therapeutics..
Asclepias. - Synonym. - Pleurisy root. The root of Asclepias tube-rosa Linne (nat. ord. Asclepiadeae).
United States, near the Atlantic Coast.
Root large and fusiform, dried in longitudinal or transverse sections, from 2 to 15 cm. long, and about 2 cm. or more in thickness; the head knotty, and slightly but distinctly annulate, the remainder longitudinally wrinkled, externally orange-brown, internally whitish; tough and having an uneven fracture; bark thin and in two distinct layers, the inner one whitish; wood yellowish, with large, white, medullary rays. It is inodorous, and has a bitterish, somewhat acrid taste.
Dose, 1/4 to 2 dr.; 2. to 8. gm.
By maceration and percolation with Diluted Alcohol, and evaporation. Dose, 1/2 to 2 fl. dr.; 2. to 8. c.c.
Pleurisy root possesses diaphoretic, carminative, and expectorant properties, without being stimulant. It is used in the disease which gives its name, and in various pectoral affections.