Flora of North America species comparison

60-100 cm, sometimes reclining or decumbent, glabrous.

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

3-5 mm, glabrous.

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.

not elongate, about as wide as the blade;

ligules to 0.5 mm, ciliolate;

blades 5-15 cm long, 0.5-2 mm wide, involute or flat, glabrous or sparsely hairy basally, with a wide central zone of bulliform cells evident on the adaxial surfaces as a longitudinal stripe of white, spongy tissue.

2-6 cm, eventually long-exserted;

internodes 2-4 mm, straight, glabrous.

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.

spikelets 3.5-4.5 mm;

calluses 0.5-1 mm, hairs to 1.2 mm;

lower glumes glabrous;

upper lemmas acute, entire;

awns 6-10 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 usually as long as or slightly longer than the sessile spikelets, sterile, unawned.

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.

= 60.

= 20 (for var. cirratum).