Flora of North America species comparison

30-120 cm;

nodes glabrous.

100-200 cm, nodes villous.

glabrous;

ligules shorter than 1 mm, of hairs;

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

sparsely strigose or glabrous;

ligules about 2 mm, of hairs;

blades 40-60 cm long, 20-80 mm wide, strongly plicate, with scattered hairs on each surface.

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.

30-60 cm, lanceoloid;

branches 2-5 cm, stiff;

bristles solitary, usually present only below the terminal spikelet on each branch, occasionally below non-terminal spikelets, 1-1.5 cm.

2-2.8 mm, elliptical and turgid.

3-3.5 mm.

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.

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

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

lower lemmas equaling the upper lemmas, 5-veined;

lower paleas absent or reduced to a small scale;

upper lemmas about 3 mm, nearly smooth, shiny.

= 36, 72.

= 54.