Flora of North America species comparison

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

7-180 cm.

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.

densely tomentose initially, sometimes glabrate, margins usually pilose distally;

blades 12-30 cm long, 3.5-5 mm wide; initially densely tomentose, becoming glabrous.

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.

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

3.5-6.5 mm, curving out at maturity.

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 6-10 mm;

calluses about 0.3 mm, hairs to 2 mm;

awns 9-15 mm.

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 on the proximal portion of the rames 5-10 mm, mostly staminate, with lemmas, distal spikelets often smaller (1-4 mm) and sterile, unawned or awned, awns to 2 mm.

3-5 cm, with 7-12 spikelets, usually partially to wholly exserted, sometimes appearing linear;

internodes 3.5-6 mm, often sparsely pubescent, hairs 1.5-3 mm.

= 40.