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.

15-90 cm tall, 0.7-1 mm thick, glabrous, pubescent, or tomentose;

nodes 3-4.

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

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

7-21 cm long, about 1 cm wide;

branches straight, strongly ascending to appressed, longest branches 4-5 cm.

appressed to the branches.

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, 7-11.5 mm;

lower glumes 0.9-1.1 mm wide, 4-5-veined;

upper glumes 3-veined;

florets 5.5-7 mm long, 0.8-1.3 mm thick, fusiform, somewhat laterally compressed;

calluses 0.4-1.2 mm, blunt;

lemmas coriaceous, evenly pubescent, hairs 0.4-1 mm, apices 1-lobed, lobe about 0.1 mm long, thick, stiff, apical lemma hairs 0.4-0.8 mm;

awns 16-30 mm, persistent, (once)twice-geniculate, all segments scabrous, terminal segment straight;

paleas 4.5-6.5 mm, from 3/4 as long as to equaling the lemmas, sparsely to moderately pubescent, hairs not exceeding the apices, veins terminating below the apices, apices flat or pinched;

anthers 2.3-3.5 mm, dehiscent, not penicillate.

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, pubescent, or tomentose;

collars, including the sides, glabrous or sparsely pubescent, hairs shorter than 0.5 mm;

basal ligules 0.5-1.2 mm, hyaline, glabrous, truncate to acute;

upper ligules to 2.5 mm;

basal blades 0.5-1.5 mm wide, folded to convolute, abaxial surfaces smooth, glabrous, adaxial surfaces prominently ribbed, often with 0.3-0.5 mm hairs, sometimes glabrous;

upper blades to 2.5 mm wide, otherwise similar to the basal blades.

= unknown.

= 34.