Flora of North America species comparison

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

60-95 cm, slender, erect, glabrous.

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.

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.

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.

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.

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

5-6 mm, hairs 5-7 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 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 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.

spikelets 0.8-4 mm, sterile, unawned.

= 40.

= unknown.