Botanical name: 

11. POLYTRICHUM JUNIPERUM Hedwig.—HAIR-CAP MOSS. This common moss is a powerful diuretic; in full doses given at very short intervals it has proved very beneficial in dropsy. Dose: 1 to 2 dr. (4 to 8 Gm.), in infusion.

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