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..
Cinna glomerata Walt. Fl. Car. 59. 1788.
Andropogon macrourum Michx. Fl. Bor. Am. 1: 56. 1803.
Andropogon glomeratus B. S. P. Prel. Cat. N. Y. 67. 1888.
Culms erect, 1 1/2º-3º tall, smooth, simple below, much branched above, upper nodes of branches barbed; sheaths compressed, scabrous, glabrous or pubescent; leaves l"-2 1/2" wide, scabrous, long-acuminate, the basal two-thirds as long as to equalling the culm, those of the culm 6'-12' long; branches elongated, forming a compact terminal inflorescence; racemes in pairs, io"-15" long, loose, protruding from the side or exserted from the apex of the scabrous spathes; rachis flexuous, the joints and pedicels pubescent with long spreading silky hairs; outermost scale of sessile spikelet about 2"-2 1/2" long; awn 6"-9' long, scabrous; pedicelled spikelet reduced to a single scale or wanting.
Andropogon virginicus L. Sp. PI: 1046. 1753.
Cinna lateralis Walt. Fl. Car. 59. 1788.
A. dissitiflorus Michx. Fl. Bor. Am. 1: 57. 1803.
A. vaginatus Ell. Bot. S. C. & Ga. 1: 148. 1817.
A. tetrastachyus Ell. Bot. S. C. & Ga. 1: 150. 1817.
Culms erect, smooth, 1 1/2°- 4° tall, simple at base, branching above; sheaths, at least the lower, more or less hirsute; blades 6'- 1 1/2° long, I"-3" wide, long-acuminate, scabrous on the margins, usually hirsute above; branches of culm short, forming a loose and elongated inflorescence; racemes in pairs, occasionally 3 or 4, 10"-30" long, loose, protruding from the side of the spathes, the rachis flexuous, slender, the joints and pedicels pubescent with long spreading silky hairs; outermost scale of sessile spikelet l 1/2"-2" long; awn 4"-9" long, straight, scabrous; pedicellate spikelet generally wanting, occasionally a rudimentary scale present.
In dry or moist fields, Massachusetts to Illinois, Florida and Texas; in the Bermudas, Bahamas and tropical America. Aug.-Sept.
Andropogon Elliottii Champ. Fl. S. States, 581. i860.
Culms erect, 1°-3° tall, simple or sparingly branched above, the branches strongly bearded at the upper nodes; sheaths glabrous or loosely villous, the lower narrow, the upper elongated, inflated, imbricated; blades 2'-10' long, 1/2"-2 1/2" wide; racemes in pairs, rarely in 3's, 1'-2' long, loose, some of them long-exserted; rachis slender, flexuous, its joints and the pedicels pubescent with long spreading silky hairs; outermost scale of the sessile spikelet I 1/2"-2" long, scabrous on the keel; awn 6"-9" long, scabrous; pedicellate spikelet a minute scale or wanting.
In dry or moist places, southern New Jersey to Missouri, south to Florida and Texas. Aug.-Sept.