Flora of North America species comparison

40-120 cm, erect, not rooting or branching at the lower nodes, glabrous.

40-120 cm, branching at the upper nodes, glau-cous.

glabrous, rounded;

ligules 0.7-2 mm;

blades 7-20 cm long, 1-6 mm wide, usually with long, papillose-based hairs basally, glabrous elsewhere, sometimes scabrous, without a longitudinal stripe of white, spongy tissue.

4-6 cm;

rames 4-15 cm, not open, usually almost fully exserted at maturity;

internodes 4-6 mm, straight, from mostly glabrous with a tuft of hairs at the base to densely hirsute all over.

3-6 mm long, 0.3-0.5 mm wide at the base, gradually widening to about 0.6-0.8 mm at the top, straight.

arcuate at maturity, ciliate on both edges distally.

spikelets 5-9 mm;

calluses 0.5-1 mm, hairs to 2 mm;

lower glumes glabrous or densely pubescent;

upper lemmas cleft for (2/3)3/4-7/8 of their length;

awns 15-25 mm.

spikelets 5-9 mm;

lower glumes sparsely to densely hirsute on the back;

awns 15-25 mm.

spikelets 3-5 mm, usually evidently shorter than the sessile spikelets, sterile or staminate, awned, awns 0.3-6 mm.

spikelets 3-5 mm, staminate or sterile, awns 0.3-5 mm.

1-2 mm;

blades 10-20 cm long, 1.5-5 mm wide.

4-10(12) cm;

internodes scabrous, glabrous or hirsute.

= 40, 60, 70, 100.