Flora of North America species comparison

50-100 cm;

nodes usually glabrous.

30-100 cm;

nodes glabrous.

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.

mostly glabrous, margins ciliate distally;

ligules 1-2 mm, of hairs;

blades 5-15 mm wide, flat, abaxial surfaces scabrous, adaxial surfaces sparsely villous.

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.

5-15 cm, tapering to the apices, branches verticillate;

rachises antrorsely rough hispid, without villous hairs;

bristles solitary, 4-7 mm, antrorsely or retrorsely scabrous.

2-2.5 mm, ovate-lanceolate.

2-2.3 mm.

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.

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

upper glumes nearly as long as the spikelets;

lower paleas about 1/2 as long as the spikelets, broad;

upper lemmas finely and transversely rugose;

upper paleas similar to the upper lemmas.

= unknown.

= 36.