Flora of North America species comparison

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

60-95 cm, slender, erect, glabrous.

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.

glaucous;

sheaths compressed, scabridulous, glabrous or almost so;

ligules 1-1.5 mm, truncate, erose-ciliate;

blades 10-25 cm long, 2-2.5 mm wide, flat, scabrous, young blades ciliate basally.

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.

5-9 cm, mostly erect, often included in the subtending leaves, with 2 rames;

rames 3.5-5 cm, enclosed or exerted at maturity;

internodes 4-6.3 mm, ciliate proximally, densely villous on the distal 1/2 - 2/3, hairs 4-7 mm.

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 mm, hairs 5-7 mm.

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 7-8 mm;

calluses 0.2-0.5 mm, hairs 1-2 mm;

lower glumes glabrous, keels scabridulous distally;

awns 14.5-17.5 mm, once-geniculate.

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

spikelets 0.8-4 mm, sterile, unawned.

= unknown.