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.

25-70 cm tall, 0.7-1.3 mm thick, glabrous or partly scabridulous;

nodes 3-4.

glabrous or scabridulous, sometimes puberulent on the distal margins, hairs to 0.8 mm;

collars glabrous, sometimes with tufts of hair on the sides, hairs to 1 mm;

basal ligules 1.5-4 mm, hyaline, glabrous, acute;

upper ligules to 2 mm;

blades usually convolute, 0.1-1 mm in diameter, abaxial surfaces smooth or scabridulous, adaxial surfaces pubescent.

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

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

9-20 cm long, 8-14 cm wide;

branches ascending to strongly divergent, longest branches 3-15 cm;

pedicels paired, conspicuously divaricate, shorter pedicels in each pair usually at least 1/2 as long as the longer pedicels.

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, 5-9 mm long, 0.8-2 mm wide, saccate below, puberulent, hairs about 0.1 mm, tapering above midlength, apices acuminate;

lower glumes 5-veined at the base, 3-veined at midlength;

upper glumes 5-7-veined at the base;

florets 3-4.5 mm long, 1-2 mm thick, obovoid;

calluses 0.4-1 mm, sharp;

lemmas indurate, densely and evenly pilose, hairs 2.5-6 mm, easily rubbed off, apices not lobed;

awns 3-6 mm, rapidly deciduous, not geniculate, scabrous;

paleas subequal to the lemmas in length and texture, glabrous, apices pinched;

anthers 1.5-2 mm, penicillate, dehiscent, well-filled.

2-3 mm.

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.

= unknown.

= 46, 48.