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 tufted, erect or ascending, 6'-1° tall, villous-puberulent below, later branched, the branches crowded at the base; leaves 2 or 3; sheaths puberulent and often pilose; Iigule a ring of hairs \" long or less; blades on the culm erect, up to 3'-4' long, 1 1/2" wide or less, glabrous above, appressed-pubescent beneath, the basal blades shorter and broader; panicle up to 2Y long, the axis and the ascending or nearly erect branches puberulent; spikelets nearly 1" long, oval, densely pubescent with spreading hairs.
Sandy places, Nantucket, Mass. June-Sept.
Culms tufted, 10'-2° tall, slender, ascending, papillose-hirsute with long spreading hairs, finally much-branched and prostrate and forming broad mats; sheaths densely papillose-hirsute with long spreading hairs; Iigule 2" long or more; blades 1 1/2'-4' long, 2 l/2"-5" wide, the upper surface glabrous or with a few long scattered hairs at the base, the lower surface densely and softly pubescent, the blades on the branches much shorter and spreading; panicle 1 1/2'-4' long, ovate, its branches ascending; spikelets 3/4" long or a little more, about 1/2 as wide, elliptic or obovoid, strongly pubescent with long spreading hairs.
In moist ground or in woods, Maine to Minnesota, south to Georgia and Texas. July and Aug.
P. lanuginosum Ell. Bot. S. C. & Ga. 1: 123. 1817. Panicum aubiirne Ashe, Bull N. C. Exp. Sta. 175: 115. 1900.
Culms, sheaths and leaves villous with spreading hairs, those on the leaves and the upper part of the culm shorter. Culms leafy, tufted, 1°-2 1/2° tall, erect, at length branched, . a smooth ring below each barbed node; sheaths shorter than the internodes; Iigule a ring of long hairs; blades erect, lanceolate, acuminate, 1 1/2'-5' long, 2"- 4 1/2" broad; panicle ovate, 1 1/2'-4' long, the axis pubescent, the branches ascending, the larger 1'-2' long; spikelets numerous, broadly obovate, from a little less than 3/4" to nearly 1" long, the first scale orbicular, glabrous or pubescent, 1-nerved, the second and third scales nearly orbicular when spread out, 7-9-nerved, densely pubescent with spreading hairs.
Dry sandy soil, southern New Jersey to Florida, Louisiana and Texas. July and Aug.
P. Addisonii Nash, Bull. Torr. Club, 25: 83. 1898.
Culms io'-I5' tall, rigid, tufted, erect or decumbent at the base, at length much branched, the branches erect, pubescent below with long nearly appressed hairs which decrease in length toward the summit where they are very short. Sheaths often longer than the internodes, appressed-pubes-cent, at least the lower ones; ligule a ring of hairs; blades erect, lanceolate, thickish, smooth and glabrous on both surfaces, rough on the margins, acuminate, 1' - 3' long, 1 1/2"-3" wide; panicle ovate to oblong, f'-2i' long, its branches spreading or ascending; spikelets obovate, 1" long, the first scale acute or acutish, about one-half as long as the spikelet, 1-nerved, pubescent, second and third scales 9-11-nerved, densely pubescent with spreading hairs.
Sandy soil, Massachusetts to South Carolina. May-June.