Stems twining, usually climbing, to 1.5 m; stem, cal, and at least the lower surface of the lfls loosely spreading-hairy; lfls commonly ovate or ovate-oblong, varying to narrowly oblong; racemes often 1 dm, loose, the fls well separated by internodes often 1-3 cm; fls 7-10 mm; cal-lobes 2-4 mm; fr 2-4 cm, shortly and densely spreading-hairy; 2n=20. Dry upland woods and barrens; s. N.Y. to s. O., Mo., and Kans., s. to Fla. and Tex. July, Aug. (G. regularis, probably misapplied) Plants occurring mainly in the Mississippi Valley region, with the lfls loosely hairy on the upper as well as the lower surface, may warrant recognition as var. mississippiensis Vail (G. mississippiensis).
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Stems mostly prostrate and straight or twining only at the tip, retrorsely strigillose or glabrate; lfls elliptic to ovate-oblong or oblong-lanceolate, strigillose or glabrate beneath, glabrous to strigillose-scaberulous above, the terminal one 2-5 cm; racemes few-fld, 3-6(-10) cm, the fls nearly adjacent, 12-18 mm; cal-tube glabrous or strigose, the lobes 3.5-7 mm; frs 3-5 cm, strigose. Dry sandy woods and barrens, chiefly on the coastal plain; s. N.Y. to Fla. and Miss. July, Aug. (? G. glabella)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.