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°-2° tall, densely tufted, erect, appressed papillose-hirsute, finally branched; sheaths similarly pubescent but the hairs more spreading; ligule 1 1/2" long; blades 1'-2' long, 2"-3' wide, lanceolate, erect or ascending, firm, softly pubescent on the lower surface, ciliate at the base, glabrous on the upper surface; primary panicle 1'-2' long, rarely larger or smaller, broadly ovate, its branches ascending; spikelets a little over 1/2" long and about 1/2 as wide, oval, pubescent with short-spreading hairs.
In usually dry sandy soil, southern New Jersey to Florida and Texas. Cuba. June and July.
P. pitbescens Nash, in Britt. & Br. 111. Fl. 1: 121. 1896.
Culms at first erect and simple, later profusely branched and leaning or ascending, papillose-hirsute with ascending hairs, the nodes barbed; sheaths papillose-hirsute; ligule 1/2"-2" long; blades copiously pilose on the upper surface, densely pubescent on the lower, erect to spreading, firm or lax, those of the culm 2'-3' long, those of the branches much shorter; primary panicle 1 1/2'-4' long, ovoid, the branches ascending or spreading; lateral panicles much smaller, not exceeding the leaves; spikelets about 3/4" long, pubescent.
Panicum scoparioides Ashe, Journ. E. Mitch. Sci. Soc. 15: 53. 1898.
Culms 1°-2 1/2° tall, rather slender, pubescent with ascending hairs, finally branched; sheaths strongly papillose-hispid with ascending hairs; ligule i"-i 1/2" long; blades 2'-4' long, 2 1/2"-4" wide, lanceolate, ascending, glabrous on the upper surface, the lower surface more or less pubescent with scattered spreading hairs; panicle barely exserted, 2'-3 long, its branches ascending; spikelets a little less than 1 1/4" long and about 1/2 as wide, elliptic, pubescent.
In dry soil, Vermont to Pennsylvania, Delaware and Minnesota. July and August.
Panicum languidum Hitch. & Chase, of Maine, Massachusetts and New York, differs from this and related species by its pointed spikelets.
P. villosissimum Nash. Bull. Torr. Club, 23: 149. 1896. P. atlatiticum Nash, Bull. Torr. Club, 24: 346. 1897.
Papillose-pilose with long white spreading hairs.
Culms tufted, at length branched, 12'-20' tall, erect or ascending, a smooth ring below the nodes which are barbed with spreading hairs; sheaths shorter than the internodes; ligule a ring of hairs 1"-2 1/2" long; blades erect or ascending, rigid, thickish, lanceolate, 1 1/4'-4' long, 2"-3 1/2" wide, acuminate, middle leaves the longest; panicle 1 1/2'-3' long, 1 1/4'-2 3/4' wide, the branches and their divisions hispidulous; spikelets numerous, obovate to elliptic, about 1 1/4" long, 3/4" wide, densely pubescent with short spreading hairs.
Dry soil, Massachusetts to Minnesota, Florida, Texas and Missouri. June-Aug.
Panicum pseudopubescens Nash, differs in nearly ap-pressed pubescence of the culms and glabrous upper leaf-surfaces. It ranges from Connecticut to Illinois, Florida and Mississippi.