Flora of North America species comparison

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

31-75 cm, often decumbent, not rooting or branching at the lower nodes, glabrous, glaucous, sometimes purplish.

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.

3.5-5 mm long, 0.2-0.5 mm wide at the base, widening to 0.5-1 mm, straight, with a tuft of hairs at the base, distal 1/2 usually ciliate on 1 side, sometimes on both sides.

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 8-10 mm;

calluses 0.3-0.6 mm, hairs 0.5-1.2 mm;

glumes glabrous or scabrous;

awns 13-24 mm.

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

spikelets 6-8 mm, about as long as the sessile spikelets, usually staminate, sometimes sterile, unawned.

1-2.5 mm;

blades 6-17 cm long, 2-4 mm wide, glabrous, without a longitudinal stripe of white, spongy tissue.

4-6 cm, usually exerted, straight, often somewhat stiff, not flexuous, appearing linear;

internodes straight, with a tuft of hairs near the base, elsewhere glabrous or ciliate on the margins.

= 20 (for var. cirratum).