Flora of North America species comparison

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

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

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.

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.

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.

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.

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

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

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 5-6.5 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 3-5 mm, usually evidently shorter than the sessile spikelets, sterile or staminate, awned, awns 0.3-6 mm.

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

= 40.