Flora of North America species comparison

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

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

lower internodes usually shortened and compressed.

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;

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.

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.

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.

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

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

calluses 0.2-0.5 mm, glabrous;

lower glumes glabrous;

awns 9-20 mm.

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

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

= 40.