Flora of North America species comparison

30-100 cm tall, 1-1.5 mm thick, glabrous;

nodes usually 3.

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

nodes 3-4.

7-25 cm long, 7-15 cm wide;

branches divergent, flexuous, longest branches 7-10 cm, with the spikelets confined to the distal 1/4.

7-21 cm long, about 1 cm wide;

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

pendulous.

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.

7.5-11 mm long, 0.9-1.2 mm wide;

upper glumes 2-3 mm shorter;

florets 5-6 mm long, 0.6-0.9 mm thick, fusiform, terete;

calluses 0.4-0.7 mm, blunt;

lemmas evenly hairy on the lower portion, often glabrate distally, body and apical hairs 0.2-0.5 mm, apical lobes not or scarcely developed, to 0.1 mm;

awns 15-25 mm, persistent, twice-geniculate, first 2 segments strigulose, hairs about 0.1 mm, terminal segment straight;

paleas 2.2-3.6 mm, 1/2 - 3/5 as long as the lemmas, pubescent, hairs not exceeding the apices, apices rounded;

anthers 2.5-3 mm, dehiscent, penicillate, hairs 0.1-0.5 mm.

3-4 mm, fusiform.

4-5 mm, fusiform.

sheaths glabrous, margins ciliolate;

collars glabrous, without tufts of hair on the sides;

ligules 0.1-0.5 mm, truncate, ciliolate;

blades 0.8-3 mm wide, convolute when dry, abaxial surfaces scabridulous, adaxial surfaces glabrous.

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.

= 44.

= 34.