Flora of North America species comparison

110-140 cm tall, 2.5-4 mm thick, internodes densely and retrorsely pubescent for 3-9 mm below the nodes, particularly the lower nodes, glabrous or retrorsely puberulent elsewhere;

nodes 3, pubescent or glabrate.

30-250 cm tall, 2-3 mm thick, glabrous, smooth;

nodes 1-3.

21-25 cm long, (2)4-8 cm wide;

branches strongly divergent to ascending, straight, lower branches 5-7 cm.

12-50 cm long, 4-15 cm wide;

branches ascending, usually whorled, longest branches 2.5-15 cm, with 15+ spikelets.

appressed to the branches.

subequal, 8-11.5 mm;

lower glumes 0.5-1 mm wide, 3-5-veined;

upper glumes 3-veined;

florets 5.5-7.5 mm long, 0.7-1 mm thick, fusiform, terete;

calluses 0.25-1.2 mm, acute;

lemmas evenly hairy, hairs at midlength and at the apices 0.5-1 mm, apical lobes 0.2-0.4 mm, membranous, flexible;

awns 20-50 mm, persistent, twice-geniculate, all segments scabrous to scabridulous, terminal segment straight;

paleas 2.6-3.8 mm, 1/2 - 3/4 as long as the lemmas, pubescent, hairs not extending beyond the apices, veins terminating below the apices, apices rounded;

anthers 2.5-4 mm, dehiscent, not penicillate.

4-8.5 mm, acute;

lower glumes 0-1.7 mm shorter than the upper glumes;

upper glumes 0.5-0.9 mm wide;

florets 4-7.2 mm, fusiform;

calluses 0.3-0.5 mm, blunt;

lemmas evenly hairy, hairs at midlength to 1 mm, apical hairs to 1.5 mm, apical lobes 0.5-1 mm;

awns 5-12 mm, readily deciduous, indistinctly once-geniculate or flexuous, scabrous;

paleas slightly shorter than the lemmas, pubescent;

anthers 3-4.5 mm, dehiscent, penicillate, yellow.

2-4 mm, fusiform.

sheaths mostly glabrous or puberulent, margins ciliate distally;

collars glabrous or with hairs, hairs mostly to 0.5 mm, sides with tufts of 1.5-2 mm hairs;

ligules 0.4-2 mm, rounded to acute, abaxial surfaces hairy, hairs to 0.5 mm;

upper ligules 1-3 mm, similar in structure and pubescence;

blades 1-3.5 mm wide, abaxial surfaces smooth or scabrous, adaxial surfaces prominently ribbed, hairy, hairs 2-3 mm.

sheaths glabrous or the margins ciliate, becoming fibrous with age;

collars glabrous, including the sides;

basal ligules 1-3 mm, membranous, glabrous, truncate to acute;

upper ligules to 12 mm, acute;

blades to 60 cm long, 2-5 mm wide, abaxial surfaces smooth, adaxial surfaces scabrous.

= unknown.

=42, 48.