562. Helianthella tenuifolia.

Botanical name: 
Phoebanthus tenuifolius

562. HELIANTHELLA TENUIFOLIA Torrey and Gray.—The root of this plant has the properties of an aromatic expectorant and antispasmodic, used as an addition to cough mixtures.

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