Flora of North America species comparison

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

nodes 3-4.

15-90 cm tall, 0.5-0.8 mm thick, usually glabrous, sometimes puberulent to 5 mm below the lower nodes;

nodes 2-3.

7-21 cm long, about 1 cm wide;

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

7-19 cm long, 0.5-1 cm wide;

branches straight, appressed to strongly ascending, longest branches 1.2-2.5 cm.

appressed to the branches.

appressed to the branches.

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.

6.5-9 mm, subequal;

lower glumes 1(3)-veined;

upper glumes to 0.5 mm shorter than the lower glumes, 0.6-1 mm wide, 1-veined;

florets 4.5-6 mm long, 0.8-1 mm thick, fusiform, teret, widest below midlength;

calluses 0.4-1 mm, blunt;

lemmas evenly hairy, hairs at midlength about 0.5 mm, apical hairs 0.7-1.5(2) mm, apical lobes 0.3-0.8, membranous, flexible;

awns 12-25 mm, persistent, twice-geniculate, scabrous, terminal segment straight;

paleas 3-4 mm, 3/4 - 4/5(9/10) as long as the lemmas, veins terminating at or before the apices, apices round, flat, apical hairs 0.5-1 mm, extending beyond the palea body;

anthers 1.5-2 mm, dehiscent, not penicillate.

4-5 mm, fusiform.

about 4 mm, fusiform.

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.

sheaths smooth, glabrous, margins not ciliate;

collars, including the sides, glabrous or sparsely pubescent, collars of the flag leaves glabrous;

ligules 0.2-1.5(2) mm, without tufts of hair on the sides, truncate to rounded;

blades 0.5-2, wide, abaxial surfaces smooth to scabridulous, adaxial surfaces scabrous or puberulent.

= 34.

= 32.