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.

30-50 cm tall, 1-1.3 mm thick, glabrous;

nodes 3-4.

glabrous;

collars puberulent, hairs about 0.2 mm, sometimes the margins with poorly developed tufts of hair to 0.5 mm;

ligules 1.8-5 mm, broadly to narrowly acute, glabrous;

blades 0.5-1.5 mm wide, flat or convolute, abaxial surfaces smooth, adaxial surfaces scabridulous.

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

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

6-25 cm long, 7-15 cm wide;

branches ascending to strongly divergent, longest branches 5-8 cm;

pedicels appressed to the branches, paired, unequal, shorter pedicels in each pair usually less than 1/2 as long as the longer pedicels.

appressed to the branches.

confined to the distal 1/2 of 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.

saccate below, tapering at midlength, glabrous, midveins sometimes scabridulous, apices acuminate;

lower glumes 5.5-7 mm long, 0.9-1.5 mm wide;

upper glumes about 0.3 mm shorter;

florets 2.5-3.5 mm long, 0.7-1.5 mm thick, fusiform to obovoid;

calluses 0.3-0.5 mm, blunt;

lemmas densely pilose, hairs at midlength and on the apices similar, 1.2-2 mm, apical lobes 0.5-0.6 mm;

awns 6.5-9 mm, readily deciduous, scabrous;

paleas similar to the lemmas in length, texture, and pubescence, distal hairs exceeding the paleal apices, apices rounded, flat;

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

1.5-2.5 mm, globose to obovoid.

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.

= 48.