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..
Panicum Nashianum Scribn. Bull. U. S. Dept. Agric.
Culms tufted, glabrous or puberulent, slender, 6'-15' tall, at length much branched. Sheaths glabrous, or the lower pubescent, the primary about one-third as long as the internodes, those on the branches overlapping; ligule a short sca-rious ring; blades erect or ascending, lanceolate, acuminate, smooth and glabrous, ciliate, at least at the base, 3/4'-2' long, 1"-2 1/2" wide, the leaves of the branches smaller; primary panicle 1-2' long, the branches widely spreading; spike-lets about 1" long, obovate, the first scale 1-nerved, the second and third scales 7-nerved, densely pubescent with short spreading hairs.
Pine lands, Virginia to Florida and Mississippi; also in the West Indies. March-July.
Panicum scoparium Lam. var. Liebergii Vasey, Bull. U.
5. Dept. Agric. Div. Bot. 8: 32. 1889.
P. Liebergii Scribn. Bull. U. S. Dept. Agr. Agrost. 8:
Culms erect, slender, glabrous, roughish, especially near the nodes, 1°-2° tall, at length branched. Sheaths papillose-hirsute with spreading hairs, usually longer than the internodes; ligule a short sca-rious ciliolate ring; blades erect or ascending, lanceolate, 2-4' long, 3"-6" wide, acuminate at the apex, rounded at the partly clasping base, papillose-hispid beneatli and sometimes sparingly so on the rough upper surface; panicle oblong, 2'-4' long, its branches erect or ascending; spikelets 1 1/2"-2" long, oval, the outer three scales papillose-hirsute with long spreading hairs, the first scale about one-half as long as the spikelet, ovate, acute, 1-3-nerved, the second and third scales broadly oval when spread out, 7-9-nerved
Dry soil, western New York to Manitoba and Kansas. June-July.
Culms erect, 6'-2° tall, simple or late in the season dichotomously branched above, sparingly pubescent. Sheaths strongly papillose-hispid, sometimes glabrate; blades 2'-4' long, 3"-6" wide, rounded or truncate at base, acuminate, more or less spreading, smooth above, scabrous beneath; panicles small, the primary one ex-serted, ovoid, 1 1/2'-3' long, the secondary ones much smaller and more or less included; branches of the primary panicle spreading, 8"-1 1/2' long, often flexuous; spikelets turgid, obovoid, a little over 1 1/2" long.
In dry or moist soil, Maine to British Columbia, south to Virginia, Texas and Arizona. June-Aug.