Ara'lia spino'sa, Hercules' Club, Prickly Elder. -- The bark, U.S.P. 1820-1870; East and west N. America. Prickly tree, 3-9 M. (10-30 degrees) high, leaflets crowded at summit; flowers white; bark in quills, curves, gray, prickly, inside yellowish, aromatic, acrid; contains araliin, volatile oil, resin. Stimulant, diaphoretic, demulcent (emetic, cathartic), alterative; rheumatism, skin eruptions, syphilis, colic, dyspepsia, toothache, vomiting, nervousness; externally antidote to rattlesnake bites; in infusion, decoction, tincture, masticatory. Dose, gr. 30-60 (2-4 Gm.)