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..
A perennial, usually glaucous, grass, with short flat leaf-blades, and large glabrous spikelets. Culms l 1/2°-3° tall; leaf-sheaths glabrous, or the outer basal ones sometimes pubescent, the uppermost one usually blade-less; blades erect or ascending, thickish, glabrous, or the upper surface with long hairs, linear to linear-lanceolate, acuminate, commonly less than 6' long and 5" wide; racemes usually 2, or sometimes 1 or 3, rarely 4, erect or ascending, less than 4' long, the rachis often flexuous and about 1/2" wide; spikelets singly disposed, sometimes in pairs, 1 1/2"-2" long and 1 1/4"-1 1/2" wide, oval, the outer 2 scales 3-nerved, the third scale brownish when mature.
In sandy soil, New Jersey and Maryland to Florida and Texas. Aug.-Sept.
U. S. Nat. Herb. 3: 20. 1892.
A tall perennial, sometimes glaucous, with long glabrous or hirsute leaves, and glabrous spikelets. Culms 3°-6 1/2° tall; leaf-sheaths rather loosely embracing the culm; blades erect or nearly so, flat, rather firm, linear, 1°-2 1/2° long, 3"-8" wide; racemes 3-6, rarely fewer, erect or neary so, 3'-6' long, the rachis about 3/4" wide; spikelets singly disposed or in pairs, 1 3/4"-2 1/4" long and 1 1/4"- 1 3/4|" wide, oval, the outer 2 scales 3-nerved.
In dry or moist soil, Delaware to Kansas, south to Florida and Texas. Sept.
Culms erect, 1 1/2°-6° tall, smooth and glabrous. Sheaths compressed, smooth and glabrous; leaves 1° or less long, 1 1/2-6" wide, long-acuminate, rather scabrous on the margins, sometimes with a tuft of hairs at the base; racemes 3-8, 2'-5' long, erect or ascending, the rachis less than 1" wide, somewhat flexuous, scabrous; spikelets in pairs, about 1 1/2" long, acute; outer scales 5-7-nerved, the first ciliate with long hairs on the margins, the second glabrous or sparsely ciliate, the third nearly orbicular, minutely punctate-striate.
In moist soil, Virginia and Tennessee to Florida and Texas. Aug.-Sept. Large Water-grass.
Culms erect, 4'-2° tall, extensively creeping at the base. Sheats smooth, sometimes ciliate on the margins, or sparsely pubescent; blades flat, 1 1/2'-5' long, l"-3" wide, acuminate, smooth; racemes I-2 1/2 long, in pairs, or occasionally with a third, the rachis flat, 1/2"-1" wide, smooth; spikelets 1 1/4"-1 1/2" long, ovate, acute, nearly sessile in 2 rows, the outer scales 5-nerved, the first glabrous, the second ap-pressed-pubescent, the acute third sparingly bearded at the apex.