569. Pterocaulon pycnostachyon.—Black root.

Botanical name: 
Pterocaulon virgatum

569. PTEROCAULON PYCNOSTACHYON Elliott.—BLACK ROOT. Leaves used by the Indians as an alterative. Dose: 15 to 30 gr. (1 to 2 Gm.).

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