229. Spiraea tomentosa.—Hardhack.

229. SPIRAEA TOMENTOSA Linné.—HARDHACK. An indigenous herb used as astringent and tonic in doses of 30 to 60 gr. (2 to 4 Gm.). As found in market it consists of the slender, reddish-brown stems, broken leaves covered below with a rust-brown wool, and a few of the dull reddish flower-petals. Odor slight, aromatic; taste astringent and bitter.

A Manual of Organic Materia Medica and Pharmacognosy, 1917, was written by Lucius E. Sayre, B.S. Ph. M.