Flora of North America species comparison

50-100 cm;

nodes usually glabrous.

30-90 cm;

nodes glabrous, strigose, or with appressed hairs.

glabrous or finely pubescent, margins ciliate distally;

ligules of 1 mm hairs;

blades 15-20 cm long, 6-12 mm wide, flat or folded, often finely pubescent on both surfaces.

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.

15-20 cm, loosely spikelike, interrupted, attenuate;

rachises often villous;

branches ascending, lower branches about 2.5 cm;

bristles usually solitary, less than 10 mm, antrorsely scabrous.

5-20 cm, erect, slender, interrupted;

rachises scabrous;

bristles 2-8 mm.

2-2.5 mm, ovate-lanceolate.

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

about 1/2 as long as the spikelets, 3-veined;

upper glumes about 2/3 as long as the spikelets, 5-7-veined;

lower lemmas equaling the upper lemmas;

lower paleas as long as the upper paleas, broad;

upper lemmas finely and distinctly transversely rugose.

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.

= unknown.