Flora of North America species comparison

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

nodes 3-4.

25-90 cm tall, 0.5-1.6 mm thick, glabrous;

nodes 3.

7-21 cm long, about 1 cm wide;

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

7-21 cm long, 0.5-1 cm wide;

branches appressed to ascending, straight.

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.

10-17 mm long, 0.7-1.2 mm wide, exceeding the upper glumes by 2.5-4.5 mm, apices tapering, often slightly recurved;

florets 6-9.5 mm long, 0.6-1.1 mm thick, fusiform, terete, widest at or below midlength;

calluses 0.5-1.5 mm, sharp;

lemmas evenly hairy, hairs at midlength to 1 mm, apical hairs 2-3 mm, ascending, apical lobes 0.3-0.5 mm;

awns 13-25 mm, persistent, usually once-geniculate, first segment scabrous, terminal segment straight;

paleas 2.5-3.5 mm, 1/3 – 1/2 as long as the lemmas, pubescent, hairs not exceeding the apices, apices rounded;

anthers 3-5 mm, dehiscent, not penicillate.

4-5 mm, fusiform.

5-6 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 becoming flat and papery, margins ciliate distally;

collars glabrous, with tufts of hair on the sides, hairs on the basal leaves to 1.5 mm, hairs on the flag leaves 1-2.5 mm;

basal ligules 0.3-0.8 mm, truncate, erose, ciliate, cilia 0.2-0.4 mm;

upper ligules to 1.5 mm, asymmetric, obliquely truncate for most of their width, abruptly longer on 1 side;

blades to 30 cm long, 2-5 mm wide, flat or involute, long-tapering.

= 34.

= 40.