[Dichanthelium oligosanthes var. helleri (Nash) Mohlenbrock, more, Panicum helleri Nash, Panicum macrocarpon Le Conte ex Torr., Panicum oligosanthes var. helleri (Nash) Fern., Panicum oligosanthes var. scribnerianum (Nash) Fern., Panicum scoparium S. Wats. ex Nash, non Lam., Panicum scribnerianum Nash]
Culms solitary or few, erect or geniculate at base, tall and stout, 7-15 dm, with a broad viscid-glabrous band just below the nodes, otherwise softly long-spreading- hairy and with bearded nodes; sheaths loose, often constricted at the summit, densely reflexed-villous at base, softly hairy distally except along the middle of the back, where glabrous and viscid; blades lanceolate, the larger 10-25 cm נ10-20 mm, slightly narrowed to the rounded base, softly hairy on both sides; primary panicle ovoid, many-fld, 8-15 cm, softly hairy, glandular-spotted; spikelets soft-hairy, obovoid, abruptly apiculate, 2-2.7 mm; first glume two-fifths as long, triangular-ovate, acute; second glume slightly shorter than the fr and sterile lemma; autumnal phase copiously branched and rebranched from the middle and upper nodes, the blades progressively reduced and the uppermost often with the sheaths hairy throughout, the panicles small, few-fld, usually shorter than the blades; 2n=18. Wet soil; Cuba and Fla. to Tex., n. to Mo., Ky., N.C., and along the coastal plain to Mass. (Dichanthelium s.)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.