Flora of North America species comparison

110-140 cm tall, 2.5-4 mm thick, internodes densely and retrorsely pubescent for 3-9 mm below the nodes, particularly the lower nodes, glabrous or retrorsely puberulent elsewhere;

nodes 3, pubescent or glabrate.

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

nodes 2-3, often puberulent.

21-25 cm long, (2)4-8 cm wide;

branches strongly divergent to ascending, straight, lower branches 5-7 cm.

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

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

appressed to the branches.

appressed to the branches.

subequal, 8-11.5 mm;

lower glumes 0.5-1 mm wide, 3-5-veined;

upper glumes 3-veined;

florets 5.5-7.5 mm long, 0.7-1 mm thick, fusiform, terete;

calluses 0.25-1.2 mm, acute;

lemmas evenly hairy, hairs at midlength and at the apices 0.5-1 mm, apical lobes 0.2-0.4 mm, membranous, flexible;

awns 20-50 mm, persistent, twice-geniculate, all segments scabrous to scabridulous, terminal segment straight;

paleas 2.6-3.8 mm, 1/2 - 3/4 as long as the lemmas, pubescent, hairs not extending beyond the apices, veins terminating below the apices, apices rounded;

anthers 2.5-4 mm, dehiscent, not penicillate.

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.

fusiform.

sheaths mostly glabrous or puberulent, margins ciliate distally;

collars glabrous or with hairs, hairs mostly to 0.5 mm, sides with tufts of 1.5-2 mm hairs;

ligules 0.4-2 mm, rounded to acute, abaxial surfaces hairy, hairs to 0.5 mm;

upper ligules 1-3 mm, similar in structure and pubescence;

blades 1-3.5 mm wide, abaxial surfaces smooth or scabrous, adaxial surfaces prominently ribbed, hairy, hairs 2-3 mm.

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.

= unknown.

= unknown.