Flora of North America species comparison

30-120 cm;

nodes glabrous.

30-100 cm;

nodes glabrous.

glabrous;

ligules shorter than 1 mm, of hairs;

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

mostly glabrous, margins ciliate distally;

ligules 1-2 mm, of hairs;

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

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.

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

rachises antrorsely rough hispid, without villous hairs;

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

2-2.8 mm, elliptical and turgid.

2-2.3 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, 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.

= 36, 72.

= 36.