Flora of North America species comparison

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

39-160 cm, branching at the lower nodes, often rooting from nodes in contact with the soil;

lower internodes usually shortened and compressed.

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;

collars usually constricted, elongate;

auricles flexible, yellow;

ligules 1.5-2 mm;

blades 10-30 cm long, 3.5-6.5 mm wide, without a longitudinal stripe of white, spongy tissue.

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.

0.5-5 mm;

rames 3-9 cm, with 13-19 spikelets, arcuate at maturity;

internodes 4-6 mm, densely villous, hairs 3-7.5 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.

5-7 mm, hairy distally, 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 6-10 mm;

calluses 0.2-0.5 mm, glabrous;

lower glumes glabrous;

awns 9-20 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 1.5-5 mm, often staminate, unawned or awned, awns to 3.5 mm.

= 40.

= 40.