Flora of North America species comparison

10-150 cm, erect, sometimes branching at the aerial nodes, glabrous, sometimes scabrous beneath the panicle;

nodes glabrous.

1.5-2(4) m, decumbent, geniculate, branching;

nodes glabrous.

green or glaucous;

sheaths glabrous or pubescent, margins ciliate;

ligules 0.5-3 mm, membranous, ciliate;

blades 3-50 cm long, 2-13 mm wide, flat, glabrous or pubescent, margins ciliate or glabrous basally.

green;

sheaths glabrous;

ligules 0.5-1.5 mm;

blades 23-40 cm long, 7-12 mm wide, flat, glabrous.

2-20 cm long, 4-35 mm wide, fully exerted from the sheaths, erect, green, brown, brown-purple, or dark purple;

rachises terete, scabrous.

terminal, 15-22 cm long, 15-21 mm wide, fully exerted from the sheaths, flexible, drooping, green;

rachises terete, puberulent.

2.5-5.6 mm, sessile, glabrous;

lower glumes 1-3 mm, 0-1-veined;

upper glumes 1.3-3.4 mm, about 1/2 as long as the spikelet, (0)1-3-veined;

lower florets staminate or sterile;

lower lemmas 2.5-5.3 mm, 3-7-veined;

lower paleas absent or 2.5-5 mm;

anthers absent or about 1.4 mm;

upper florets not disarticulating at maturity;

upper lemmas 2.2-5.4 mm, (3)5(6)-veined, margins glabrous;

anthers 1.4-2.7 mm.

5.2-6.6 mm, sessile;

lower glumes 1.7-2.9 mm, 1-veined;

upper glumes 4.5-6.3 mm, about as long as the spikelets, (7)9-veined;

lower florets sterile;

lower lemmas 4.8-6 mm, 7-veined, acuminate to attenuate, midvein excurrent for 0-0.6 mm;

lower paleas absent;

upper lemmas 4.9-6 mm, 5-veined, acuminate to attenuate, midvein excurrent for 0-0.6 mm;

anthers 1.3-1.7 mm.

1.2-1.9 mm long, 0.4-1 mm wide, concealed by the lemma and palea at maturity.

11-37 per cm, disarticulating at maturity;

fascicle axes 0.2-1.5 cm, with 1-12 spikelets;

outer bristles 16-89, 0.3-11.7 mm, many exceeding the spikelets;

inner bristles 7-20, 3.8-13.8 mm, fused to 1/4 of their length, flattened, grooved, ciliate;

primary bristles 10.5-23 mm, long-ciliate, noticeably longer than the other bristles.

24-49 per cm;

fascicle axes 0.4-0.5 mm, with 1 spikelet;

most bristles only slightly longer than the spikelets;

outer bristles 27-41, 2.4-8.5 mm;

inner bristles 3-5, 6.2-11 mm, scabrous;

primary bristles 7.6-11.8 mm, not noticeably longer than the other bristles, scabrous.

= 36, 45.

= 36.