Flora of North America species comparison

100-230 cm tall, 2-4.5 mm thick, mostly glabrous, often pubescent below the nodes, the pubescence antrorse or retrorse;

nodes 4-5.

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

nodes 3-4.

15-30 cm long, 0.8-3.5 cm wide;

branches straight, appressed to ascending, lower branches 3-9 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, 9-11.5 mm long, 1-1.4 mm wide;

florets 5.9-8.5 mm long, 0.9-1.2 mm thick, fusiform, terete;

calluses 0.3-1 mm, blunt;

lemmas evenly hairy, hairs at midlength 0.3-0.8 mm, apical hairs to 1.5 mm;

awns 20-32 mm, persistent, twice-geniculate, scabridulous to scabrous, scabrules to about 0.1 mm, longest on the middle segment, terminal segment straight;

paleas 3.7-5.6 mm, 2/3 - 3/4 as long as the lemmas, hairy, hairs about 0.5 mm, not exceeding the apices, veins terminating below the apices, apices rounded;

anthers 4-5 mm, dehiscent, 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.

5-6 mm.

4-5 mm, fusiform.

sheaths mostly glabrous, margins usually ciliate distaily;

collars hairy, those of the flag leaves densely hairy, hairs 0.5-2 mm, sides glabrous;

basal ligules 1-2 mm;

upper ligules to 4 mm, truncate, rounded, or obtuse, glabrous;

blades 6-10 mm wide, glabrous, abaxial surfaces smooth, adaxial surfaces prominently ribbed, ribs scabrous.

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.

= 64.

= 34.