This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol1", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Glyceria acutiflora Torr. Fl. U. S. 1: 104. 1824. Panicularia acutiflora Kuntze, Rev. Gen. PI. 782. 1891.
Culms 1°-2° tall, flattened, erect from a decumbent base, simple, smooth and glabrous. Sheaths loose, generally a little exceeding the internodes, smooth and glabrous; ligule 2" long, truncate; blades 3'-6' long, 2"-3" wide, smooth beneath, rough above; panicle 6'-12' in length, the branches erect or appressed, 2'-4' long; spikelets linear, 5-12-flowered, 1'- 1 3/4' long; empty scales acute, smooth; flowering scales about 4" long, lanceolate, acute, scabrous, exceeded by the long-acuminate palets.
In wet places. Maine to Delaware and Ohio. June-Aug.