Flora of North America species comparison

100-230 cm tall, 2-4.5 mm thick, mostly glabrous, often pubescent below the nodes, the pubescence antrorse or retrorse;

nodes 4-5.

15-75 cm tall.

smooth, mostly glabrous, margins ciliate;

collars glabrous, with or without tufts of hair at the sides, hairs 0.7-2 mm;

ligules 1-4 mm, glabrous or sparsely hairy, acute, sometimes ciliate;

blades 1-2 mm wide, involute, 0.5-1 mm in diameter, abaxial surfaces scabridulous or smooth, adaxial surfaces densely hairy, hairs about 0.2 mm.

15-30 cm long, 0.8-3.5 cm wide;

branches straight, appressed to ascending, lower branches 3-9 cm.

5-20 cm long, 0.5-2.8 cm wide, loosely contracted;

branches strongly ascending, longest branches 0.5-2.5(5) cm.

appressed to the branches.

evenly distributed along the branches;

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

subequal, 9-11.5 mm long, 1-1.4 mm wide;

florets 5.9-8.5 mm long, 0.9-1.2 mm thick, fusiform, terete;

calluses 0.3-1 mm, blunt;

lemmas evenly hairy, hairs at midlength 0.3-0.8 mm, apical hairs to 1.5 mm;

awns 20-32 mm, persistent, twice-geniculate, scabridulous to scabrous, scabrules to about 0.1 mm, longest on the middle segment, terminal segment straight;

paleas 3.7-5.6 mm, 2/3 - 3/4 as long as the lemmas, hairy, hairs about 0.5 mm, not exceeding the apices, veins terminating below the apices, apices rounded;

anthers 4-5 mm, dehiscent, penicillate.

slightly unequal, saccate below, tapering from about midlength, veins and sometimes also the intercostal regions puberulent, hairs to 0.1 mm, apices acute to acuminate;

lower glumes 5.1-6.1 mm;

upper glumes 4.3-5.2 mm;

florets 2.8-4.2 mm, ovoid;

calluses 0.2-0.4 mm, acute;

lemmas indurate, dark gray-brown, smooth, densely pilose, hairs at midlength and at the apices similar, 2-3 mm, easily rubbed off, apices not lobed;

awns 3-4.4 mm, rapidly deciduous, not geniculate, scabrous;

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

anthers about 1 mm, dehiscent, penicillate.

5-6 mm.

1-1.7 mm long, 0.8-1 mm in diameter, globose to obovoid.

sheaths mostly glabrous, margins usually ciliate distaily;

collars hairy, those of the flag leaves densely hairy, hairs 0.5-2 mm, sides glabrous;

basal ligules 1-2 mm;

upper ligules to 4 mm, truncate, rounded, or obtuse, glabrous;

blades 6-10 mm wide, glabrous, abaxial surfaces smooth, adaxial surfaces prominently ribbed, ribs scabrous.

= 64.

= unknown.