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..
Culms 1 1/2°-3° tall, erect, slender, simple, flattened, smooth and glabrous. Sheaths shorter than the inter-nodes; ligule pilose; blades 1" wide or less, rough, lax, the basal from one-third to one-half the length of the culm; lower culm leaves 6'-8' long, the upper 3'-6'; panicle open, 2 1/2'- 4' in length, the lower branches generally spreading; spikelets 5-10-flowered; empty scales 5"-6" long, glabrous; flowering scales oblong, with a ring of short hairs at base, pubescent with appressed silky hairs, the awn erect or somewhat bent, strongly twisted below, slightly so above, the teeth 1"-1 1/2" long, acuminate, awned.
Danthonia sericea Nutt. Gen. 1: 71. 1818.
Culms 1 1/2°-3° tall, simple,'glabrous. Sheaths shorter than the internodes, usually villous; ligule pilose; blades rough and more or less villous, 1"-1 1/2" wide, the basal one-quarter to one-half the length of the culm, usually flexuous, those of the culm 1'-4' long, erect; panicle 2 1/2'-4 1/2' in length, contracted, the branches erect or ascending; spikelets 4-10-flowered; empty scales 7"-8" long, glabrous; flowering scales oblong, strongly pubescent with long silky hairs, the awn erect or somewhat bent, closely twisted below, loosely so above, the teeth 1"-1 1/2" long, acuminate, awned.
In dry sandy soil, Massachusetts to Pennsylvania, south to Florida and Mississippi. May-July.
Danthonia glabra Nash, Bull. Torr. Club 24: 42. 1897.
Not Philippi, 1896. Danthonia epilis Scribn. Circ. U. S. Dep. Agr. Agrost.
30: 7. 1901.
Glabrous. Culms erect, tufted, 16'-28' tall, slightly roughened just below the panicle and puberulent below the brown nodes; sheaths usually shorter than the internodes; ligule densely ciliate with long silky hairs; blades smooth excepting at the apex, 1"-2" wide, erect, those on the sterile shoots 6' or more long, the culm leaves 2'-4' long; panicle 2'-3' long, contracted; spikelets, including awns, 9"-10" long, 5-10-flowered, on hispidulous appressed pedicels; empty scales acuminate; flowering scales 2 1/2"-3" long to the base of the teeth, pilose on the margins below and sometimes sparingly so on the midnerve at the base, the remainder of the scale glabrous, teeth including the awns, 1"-1 1/2" long, the central awn 4 1/2"-6" long, more or less spreading.
In swamps, southern New Jersey to Georgia. May-July.
D. intermedia Vasey, Bull. Torr. Club 10: 52. 1883.
A glabrous tufted perennial. Culms 4-18' tall; blades'up to 6' long and 2" wide, often involute; panicle 1 1/2"-2" long, contracted, dense, spike-like, variegated with purple, its branches short and ap-pressed; spikelets 7"-8" long, exclusive of the awns, the empty scales broad, acuminate, variegated with purple, the flowering scales 3 1/2"-4" long, pubescent only on the margins below the middle and at the base, the teeth acute and usually awned, the central awn 3"-4" long.