Flora of North America species comparison

30-120 cm;

nodes glabrous.

30-90 cm.

glabrous;

ligules shorter than 1 mm, of hairs;

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

glabrous, margins ciliate;

ligules ciliate;

blades to 20 cm long, 10-20 mm wide, flat, scabrous on both surfaces.

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.

10-25 cm, loosely spicate;

rachises scabrous;

bristles solitary, 7-15 mm, slender, antrorsely scabrous.

2-2.8 mm, elliptical and turgid.

2-2.7(3) mm.

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

upper glumes and lower lemmas 7-veined, the 5 central veins coalescing at the apices;

lower paleas absent;

upper lemmas gibbous, strongly and coarsely transversely rugose;

upper paleas similar to the upper lemmas.

= 36, 72.

= 18.