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.

14-50(80) cm tall, 0.4-0.9 mm thick, mostly glabrous, lower internodes often puberulent or pubescent, particularly below the nodes;

nodes 2-3.

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

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

4.5-20 cm long, 0.5-1 cm wide, contracted;

branches appressed, lower branches 1-5 cm, with 2-7 spikelets.

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, 7-11 mm long, 0.6-0.9 mm wide, lanceolate, not saccate;

florets 3.5-5.5 mm long, 0.6-0.8 mm thick, fusiform, terete;

calluses 0.4-0.6 mm, sharp;

lemmas densely and evenly pilose, hairs at midlength 1.5-3.5 mm, apical hairs to 5 mm, apical lobes 0.3-2 mm, thin;

awns 13-25 mm, persistent, twice-geniculate, first 2 segments scabrous;

paleas 2.5-4 mm, from 2/3 as long as to equaling the lemmas, hairy;

anthers 1.8-2.6 mm, dehiscent, not penicillate.

2.5-4 mm, 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 not becoming flat and ribbonlike with age, usually glabrous, throat sometimes with a few hairs, hairs about 0.2 mm;

collars glabrous, including the sides;

basal ligules 0.2-0.8 mm, truncate to rounded, membranous, glabrous;

upper ligules to 2 mm, rounded;

blades usually involute and 0.2-0.4 mm in diameter, 0.5-1 mm wide if flat, often arcuate distally, abaxial surfaces scabridulous, adaxial surfaces hairy, hairs about 0.1 mm.

= unknown.

= 32.