Sweet Venial Grass.
This has been much used in the treatment of hay fever.
Characters. - A rather slender erect perennial, 1 to 2 feet high, and quite glabrous. Spike-like panicle 1 1/2 to 2 inches long; outer glumes very pointed, the second about 3 lines long, the first seldom above half that length. Inner glumes usually quite included in them, or rarely the longest awn slightly protrudes.
Parts employed. - The flowering herb.
Preparation. - Tincture (40 O.P. spirit).
Average loss of moisture, 59 per cent.