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..
Eupatorium. - Synonyms. - Thoroughwort. Boneset. The leaves and flowering tops of Eupatorium perfoliatum Linne (nat. ord. Compositae).
North America, west to Dakota; in low grounds.
Leaves opposite, united at the base, lanceolate, from 10 to 15 cm. long, tapering, crenately serrate, rugosely veined, rough above, downy and resinous dotted beneath; flower heads corymbed, numerous, with an oblong involucre of lance-linear scales, and with from ten to fifteen white florets, having a bristly pappus in a single row; odor weak and aromatic: taste astringent and bitter.
Dose, 1/4 to 1 dr.; 1. to 4. gm.