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.

12-35 cm tall, 0.4-0.7 mm thick, smooth or antrorsely scabridulous;

nodes 2-3.

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

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

2.5-7 cm long, 0.5-2 cm wide, contracted;

branches appressed, longest branches 1-2 cm.

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.

subequal, 6-10 mm long, 0.6-0.9 mm wide, lanceolate, not saccate;

florets 4.5-6 mm long, 0.7-1 mm thick, fusiform, terete;

calluses 0.3-0.8 mm, blunt;

lemmas evenly and densely pilose, hairs 2.5-3.5 mm, apical lobes 0.6-1.9 mm, membranous;

awns 4-11 mm, readily deciduous, straight to once-geniculate, scabrous;

paleas 4-5.6 mm, from as long as to slightly longer than the lemmas;

anthers 1.6-2 mm, dehiscent, not penicillate.

3.5-4.5 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, smooth or scabridulous;

collars glabrous, without tufts ' of hair on the sides;

basal ligules 0.1-1 mm, truncate to rounded;

upper ligules 1-2 mm, acute;

blades 0.5-1.5 mm wide when flat, usually folded to involute and about 0.5 mm in diameter, stiff, abaxial surfaces smooth or scabrous, adaxial surfaces scabrous.

= unknown.

= 32.