Flora of North America species comparison

30-120 cm;

nodes glabrous.

50-200 cm;

nodes pubescent.

glabrous;

ligules shorter than 1 mm, of hairs;

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

with ciliate margins distally;

ligules about 1 mm, ciliate;

blades 10-25 mm wide, plicate, both surfaces scabrous, adaxial surfaces with parallel rows of papillose-based hairs.

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.

to 20 cm, open;

branches 2-4 cm, axes villous;

bristles solitary, usually only present below the terminal spikelet on each branch, occasionally below non-terminal spikelets, 5-8 mm, flexible.

2-2.8 mm, elliptical and turgid.

2.5-3 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 mm, orbicular, 3-5-veined;

upper glumes about 2 mm, ovate, 7-veined;

lower lemmas about 2.5 mm, slightly coriaceous, acute;

lower paleas about equaling the lower lemmas in length and width;

upper lemmas about 2.3 mm, strongly transversely rugose;

upper paleas enclosed.

= 36, 72.

= 54, 56.