Flora of North America species comparison

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

nodes usually 3.

60-150 cm tall, 2-5 mm thick, often geniculate at the lowest node, mostly glabrous;

nodes 2-3, often puberulent.

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.

10-24 cm long, 1.5-3 cm wide, contracted;

branches straight, appressed to strongly ascending, lower branches 2.5-3.5 cm.

pendulous.

appressed to the branches.

subequal, 14-16 mm;

lower glumes 1-3-veined;

upper glumes 0.6-1.5 mm wide, 3-5-veined;

florets 8-10 mm, fusiform;

calluses 0.5-1.2 mm, rounded;

lemmas evenly hairy, hairs about 0.5 mm, apical hairs similar in length, apices 2-lobed, lobes 1-3 mm, narrow;

awns 18-25 mm, persistent, scabrous, once- or twice-geniculate, terminal segment straight;

paleas as long as or slightly longer than the lemmas, hairy, hairs about 0.5 mm, veins prolonged, reaching almost to the tips of the lemma lobes;

anthers 4-6 mm, penicillate, dehiscent.

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.

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 mostly glabrous, sometimes ciliate distally, intact at maturity;

collars glabrous or pubescent, often with hairs at the sides, hairs shorter than 0.5 mm;

basal ligules 0.2-0.5 mm, membranous, truncate, ciliate, cilia 0.2-0.3 mm;

upper ligules shorter than the basal ligules;

blades 3-7 mm wide, lax.

= 44.

= unknown.