Flora of North America species comparison

30-120 cm;

nodes glabrous.

30-90 cm;

nodes glabrous, strigose, or with appressed hairs.

glabrous;

ligules shorter than 1 mm, of hairs;

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

with papillose-based hairs, sometimes nearly glabrous, margins ciliate distally;

ligules 1-2 mm, of stiff hairs;

blades 4-30 cm long, 1-7 mm wide, involute, stiff, scabridulous and narrowed basally.

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.

5-20 cm, erect, slender, interrupted;

rachises scabrous;

bristles 2-8 mm.

2-2.8 mm, elliptical and turgid.

2.1-4.5 mm, elliptic to obovate, randomly distributed on the branch axes.

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 1/2 as long as the spikelets, 5-7-veined;

upper glumes equaling the upper lemmas, 7-9-veined;

lower lemmas equaling the upper lemmas;

lower paleas absent;

upper lemmas indurate, finely and transversely rugose;

upper paleas similar to the upper lemmas.

= 36, 72.