Flora of North America species comparison

40-175 cm tall, 0.7-2.4 mm thick, lower cauline internodes usually glabrous, sometimes slightly pubescent below the lower nodes;

nodes 2-5.

55-210 cm tall, 3-6 mm thick, internodes usually glabrous, lower internodes sometimes puberulent;

nodes 1-2, glabrous.

9-36 cm long, 0.8-2 cm wide;

branches ascending to appressed, straight.

15-60 cm long, 2-4 cm wide;

branches widely spreading to ascending, longest branches 4-13 cm.

appressed to the branches.

6-12.5 mm long, 0.7-1.1 mm wide;

lower glumes exceeding the upper glumes by 0.2-0.8 mm;

florets 4.5-7 mm long, 0.6-0.9 mm thick, fusiform;

calluses 0.2-1 mm, blunt to sharp, dorsal boundary of the glabrous tip with the callus hairs almost straight to acute;

lemmas evenly hairy, hairs at midlength 0.5-1 mm, hairs at the apices to 2 mm, erect to ascending, apical lobes 0.1-0.4 mm, membranous, flexible;

awns 19-45 mm, persistent, twice-geniculate, first 2 segments scabrous or with hairs shorter than 0.5 mm, terminal segment straight;

paleas 2-4 mm, 1/3 – 2/3 as long as the lemmas, pubescent, hairs usually not exceeding the apices, veins terminating before the apices, apices rounded;

anthers 2-3.5 mm, dehiscent, not penicillate.

lanceolate, glabrous, tapering to awnlike apices;

lower glumes 16-21 mm long, 1-1.3 mm wide, midveins scabrous;

upper glumes 11-18 mm;

florets 6.5-10 mm long, about 1 mm thick, fusiform, terete;

calluses 0.5-2 mm, blunt to acute;

lemmas densely hairy, hairs at midlength 1.5-4 mm, apical hairs 2-5 mm;

awns 25-45 mm, persistent, twice-geniculate, all segments scabrous, terminal segment straight;

paleas 3.5-5.5 mm, 3/5 – 9/10 as long as the lemmas, sparsely hairy between the veins, apices flat, rounded;

anthers 3-4 mm, dehiscent, not penicillate.

3-4 mm, fusiform.

5-7 mm, fusiform.

sheaths glabrous or sparsely to densely pubescent, margins sometimes ciliate;

collars glabrous or somewhat pubescent, without tufts of hair on the sides, collars of the flag leaves glabrous or sparsely pubescent;

basal ligules 0.2-0.7 mm, membranous, truncate to rounded, usually not ciliate;

upper ligules 1-1.5 mm, acute;

blades (0.5)1.2-5 mm wide.

sheaths mostly glabrous, often puberulent on the lower portion, flat, ribbonlike with age, margins hairy distally, hairs 1-2.5 mm;

collars mostly glabrous;

ligules 0.4-1.6(3) mm, truncate to slightly rounded, abaxial surfaces pubescent, ciliate, cilia about 0.5 mm;

blades usually flat, 2.5-7 mm wide, both surfaces scabrous.

= 36, 44.

= 40.