Nat. ord,, Compositae.
Characters. - A stiff, erect annual, 1 to 2 feet high, glabrous except a few long spreading hairs. Leaves narrow, and entire or slightly toothed. Flower-heads very small and numerous, forming a long, narrow, leafy panicle. Florets minute, the outer ones filiform, scarcely longer than the involucre, white or slightly tinged with red; central ones tubular, yellowish-white.
An account and proving of this are given in Hale's New Remedies.
Part employed. - The root.
Preparation. - Tincture.