Flora of North America species comparison

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

35-80 cm, solitary, decumbent, branching at the lower nodes, often rooting from nodes in contact with the soil.

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 throughout;

sheaths shorter than the internodes, keeled;

collars constricted, elongate;

ligules 0.5-1 mm;

blades 11-142 cm long, 3.5-5.5 mm wide, folded, 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.

1-6 cm; subtending leaf sheaths 3.2-6.6 cm long, 3-6.5 mm wide;

rames 2.5-6.5 cm, flexuous, usually partially exserted, appearing somewhat open;

internodes 4-5.5 mm, straight, pubescent for 1/2 - 3/4 of their length, hairs 2.5-6 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, as conspicuously villous as the rachis.

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 9-11 mm;

calluses 0.3-0.5 mm;

hairs to 1 mm;

awns 8-13 mm.

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

spikelets 4.5-8.5 mm, staminate, unawned or awned, awns to 3.5 mm.

= 40.