Flora of North America species comparison

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

7-210 cm tall, usually 1-3 mm thick, not rooting or branching at the lower nodes.

rounded or keeled, glabrous or pubescent, sometimes glaucous;

ligules 0.5-2 mm, collars neither elongate nor narrowed;

blades 7-105 cm long, 1.5-9 mm wide, without a longitudinal stripe of white, spongy tissue.

0.8-10 cm;

rames 2.5-8 cm, partially to completely exserted, usually somewhat open;

internodes 3-7 mm, usually arcuate at maturity, ciliate on at least the distal 1/2 (sometimes throughout), hairs 1.5-6 mm.

3-5 mm, glabrous.

3-7.5 mm long, 0.1-0.2 mm wide at the base, flaring above midlength to 0.3-0.5 mm, straight or curving outwards.

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.

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 3-11 mm;

calluses 0.5-1(2) mm, hairs 0.3-4 mm;

lower glumes glabrous;

upper lemmas membranous throughout, cleft to 1/2 their length;

awns 2.5-17 mm.

spikelets usually as long as or slightly longer than the sessile spikelets, sterile, unawned.

spikelets 0.7-10 mm, sometimes shorter than the sessile spikelets, sterile or staminate, unawned or awned, awns to 4 mm, when sterile, the lemma usually absent.

= 60.

= 40.