Flora of North America species comparison

30-120 cm;

nodes glabrous.

60-120 cm, rarely branched distally, scabrous below the nodes and panicles.

glabrous;

ligules shorter than 1 mm, of hairs;

blades to 25 cm long, 2-8 mm wide, flat, scabrous above.

keeled, glabrous, usually with a few white hairs at the throat;

ligules 2-4 mm, densely ciliate;

blades 15-20 cm long, 7-15 mm wide, flat, adaxial surface scabrous.

3-8 (10) cm, of uniform width throughout their length, densely spikelike;

rachises scabro-hispid;

bristles 4-12, 2-12 mm, antrorsely barbed, yellow to purple.

10-30 cm long, 1-2 cm wide, uniformly thick from the base to the apex, dense, rarely lobed basally;

rachises scabrous and loosely pilose;

bristles usually solitary, 10-20 mm, soft, antrorsely scabrous.

2-2.8 mm, elliptical and turgid.

2-2.3 mm, subspherical.

glumes about 1/3 as long as the spikelets, 3-veined;

upper glumes 1/2 - 2/3 as long as the spikelets, 5-veined;

lower florets often staminate;

lower lemmas occasionally indurate and faintly transversely rugose;

lower paleas equaling the lower lemmas;

upper lemmas distinctly transversely rugose, often purple-tipped.

glumes 1/3 – 1/2 as long as the spikelets, 3-5-veined;

upper glumes about 3/4 as long as the spikelets, 5-7-veined;

lower lemmas equaling the upper lemmas, 5-veined;

lower paleas nearly equaling the upper paleas in length and width;

upper lemmas transversely rugose;

upper paleas convex, ovate.

= 36, 72.

= 54.