Flora of North America species comparison

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

49-90 cm, not rooting or branching at the lower nodes.

usually completely glabrous;

sheaths keeled;

ligules 0.5-1 mm;

blades 2.5-10 cm long, (1)2-4 mm wide, flat, without a longitudinal stripe of white, spongy tissue.

2-4.6 cm; subtending leaf sheaths 2.5-4 cm long, 1.5-3.5 mm wide;

rames 2.5-4.5 cm, somewhat open and usually partially exserted, varying from included to completely exserted;

internodes 3-7 mm, straight, densely villous for their full length, hairs 0.5-2.5 mm, silvery-white.

3-5 mm, glabrous.

5-6.5 mm long, 0.1-0.2 mm wide at the base, flaring beyond midlength to about 0.5 mm, densely villous.

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 5-6.5 mm;

calluses with 0.5-1 mm hairs;

lemmas slightly indurate at the base (unique among the species treated here in this respect), cleft for 3/4 - 7/8 of their length;

awns 10.5-15 mm.

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

spikelets 0.5-2 mm, sterile, unawned or awned, awns 1-2 mm.

= 60.

= 40.