418. LEDUM.—LABRADOR TEA. The leaves of Le'dum latifo'lium Aiton. Habitat: Canada and Northern States. Elliptic-oblong, covered beneath with a rust-colored wool. Besides the tannin and other principles common to the Ericaceae, they contain a poisonous principle, andromedotoxin, rendering them poisonous in large doses. Astringent, tonic, and alterative. Dose: 15 to 30 gr. (1 to 2 Gm.), in infusion.
A Manual of Organic Materia Medica and Pharmacognosy, 1917, was written by Lucius E. Sayre, B.S. Ph. M.