Flora of North America species comparison

to 200 cm, in large, dense clumps, indurate, often branching from the lower nodes.

40-100 cm tall, 2-3.5 mm thick, usually solitary, erect, terete, indurate, glabrous.

smooth to striate, glabrous;

ligules 0.5-2 mm;

blades 10-50 cm long, 3-7 mm wide, usually involute, rarely flat, abaxial surfaces glabrous, adaxial surfaces and margins scabrous, apices acuminate.

smooth or striate, mostly or completely glabrous, throats occasionally ciliate;

ligules 0.5-1 mm;

blades 6-30 cm long, 2.5-8 mm wide, flat, becoming involute, abaxial surfaces glabrous, adaxial surfaces scabrous, margins scabrous.

8-25 cm, usually shallowly sinuous or lobed in outline, with 3-16 branches;

branches 2-6 cm, usually appressed, moderately imbricate, axes glabrous, sometimes somewhat scabrous on the angles, with 10-30 spikelets.

8-25 cm, not smooth in outline, with 3-12 branches;

branches 1.5-8 cm, alternate, differing only slightly in length and spacing within a panicle, usually appressed, rarely spreading, with 10-30 spikelets.

6-9 mm.

6-11 mm, ovate to lanceolate.

with hispid keels and hispidulous margins, apices acuminate;

lower glumes 3-6 mm, to 2/3 as long as the upper glumes;

upper glumes 6-9 mm, hispidulous, 3-4-veined, lateral veins 2-3, prominent, on 1 side of the keel;

lemmas mostly glabrous, keels hispid, margins glabrous or hispid, apices acute to obtuse, sometimes obscurely lobed;

anthers about 5 mm, well-filled, dehiscent at maturity.

with glabrous or sparingly hispidulous margins, apices acute or mucronate;

lower glumes 3-7 mm, sides narrow, glabrous or sparsely pubescent, keels glabrous or strigose;

upper glumes 6-10 mm, usually equaling the florets, keels strigose, hairs 0.2-0.5 mm, lateral veins 2, inconspicuous, both on the same side of the keel;

lemmas glabrous or sparsely hirsute, keels hirsute, at least distally, hairs 0.3-1 mm, margins sparsely hairy, apices obtuse to rounded, sometimes obscurely lobed;

paleas sparsely hispid distally, obtuse to slightly rounded;

anthers 2.5-5 mm, well-filled, dehiscent at maturity.

= 40.

= 40.