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..
1816. ?Panicum neuranthum Griseb. Cat. PI. Cub. 232. 1866.
Culms tufted, slender, at length much branched, the primary simple, erect, glabrous or pubescent, 12'-30' tall. Sheaths glabrous, or the lower pubescent, the primary about one-half as long as the internodes, those on the branches overlapping; ligule a ring of hairs; blades smooth and glabrous, the primary erect, acuminate, 1'-4' long, 1"-2 1/2" wide, those on the branches shorter, erect or ascending, usually involute when dry, concealing the small secondary panicles; primary panicle 1'-4 long, its branches at first erect, at length widely spreading; spikelets numerous, broadly obovate, about 1" long, densely pubescent with short spreading hairs, the second and third scales 7-nerved.
Dry or moist soil along the coast. New Jersey to Florida and Texas. Recorded from West Indies. June-Oct.
Panicum villosum Ell. Bot. S. C. & Ga. 1: 124. 1817.
Not Lam. 1791. P. consanguineum Kunth, Rev. Gram. 1: 36. 1829.
Culms 1°-2 1/2° tall, finally much-branched, the nodes densely barbed with spreading hairs; sheaths shorter than the internodes, densely villous; blades erect, linear-lanceolate, the primary ones 1 1/2"-3' long, 1 1/2"-5" wide, those on the branches much smaller, flat, usually less than 2' long; primary panicle 1 1/2"-3' long, oval, its branches ascending; spikelets about 1 1/4" long and about i as wide, broadly obovoid, densely pubescent with spreading hairs.
In dry sandy soil, southeastern Virginia to Florida and Texas. June and July.
A tufted nearly glabrous perennial. Culms about 1° tall, finally much-branched; blades erect, linear, acuminate, very rough on the margins, ciliate at the base with a few long hairs, otherwise glabrous, the larger primary blades 3'-4' long, 1 1/2"-2" wide; panicle much-exserted, 2 1/2'-3' long, its branches ascending; spikelets 1 1/4" long and about 1" wide, obovoid, glabrous.
In dry ground, Missouri. June and July.
Panicum sphaerocarpon Ell. Bot. S. C. & Ga. 1: 125. 1817.
Culms generally erect, simple or somewhat branched at base, 10'-2° tall, smooth, or the nodes sometimes pubescent. Sheaths shorter than the internodes, or overlapping, glabrous, the margins ciliate; blades 2-4' long, 2"-7" wide, acuminate, cordate-clasping at base, scabrous above, smooth beneath, the margins cartilaginous and minutely serrulate, ciliate towards the base; panicle ovoid, 2-4' long, about as broad as long; spikelets less than 1" long, nearly spherical or somewhat longer than thick, obtuse, purple; first scale broadly ovate, obtuse; third and fourth scales three to four times as long as the first, suborbicular, 7-nerved; fourth scale oval, obtuse, 3/4" long.
Dry soil, Vermont to Kansas, south to Florida, Texas and Mexico, northern South America. July-Sept.