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..
Perennial tufted grasses with stiff culms and a panicle composed of scattered distant widely spreading rigid branches. Spikelets scattered and distinct, singly disposed in two rows, sessile, 4-6-flowered. Scales 6-8, firm; two lower scales empty, acuminate, about equal, the first 1-nerved, the second usually 3-nerved; flowering scales very acute, becoming harder in fruit, 3-nerved, the nerves glabrous, the lateral nerves vanishing at the margin below the apex; palet compressed, its two nerves ciliolate, gibbous at the base, obtuse at the apex. Stamens 3. Styles distinct. Stigmas plumose. [Greek, in reference to its rigid branches.]
A monotypic genus of south central United States.
Culms 8'-3 1/2° tall, erect, simple, smooth and glabrous. Sheaths short, crowded at the base of the culm, smooth, pilose at the summit; ligule a ring of short hairs; blades 2'-6' long, 3/4"- 1 1/2" wide, rough above, glabrous or sparingly pilose beneath; panicle 8'-16' in length, the branches stout, rigid, widely diverging; spikelets scattered, closely sessile, appressed, 5-12-flowered, 4"-7" long, empty scales about equal in length, acute; flowering scales very acute, about 2" long, the lateral nerves very prominent.