Flora of North America species comparison

30-100 cm;

nodes pubescent, hairs appressed.

30-100 cm;

nodes glabrous.

with ciliate margins;

ligules ciliate;

blades to 12(25) cm long, to 10(20) mm wide, flat, hispid 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.

3-18 cm, loosely spicate, interrupted, often purple;

rachises hispid;

bristles 1-3, 5-15 mm, flexible, 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.

1.5-2.2 mm.

2-2.3 mm.

about 1/3 as long as the spikelets, distinctly 3-veined, lateral veins coalescing with the central veins below the apices;

upper glumes nearly equaling the upper lemmas, obtuse, 5-veined;

lower lemmas equaling the upper lemmas;

lower paleas about 1/3 as long as the lower lemmas, narrow;

upper lemmas finely and transversely rugose;

upper paleas similar to the upper lemmas.

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.