Flora of North America species comparison

90-200 cm, erect;

nodes sunken, glabrous or pubescent, brown.

to 100 cm, erect;

nodes pubescent.

pubescent;

ligules 4-5 mm, membranous, brown, acute;

blades 12-40 cm long, 8-35 mm wide, flat or conduplicate, pubescent below, glabrous above, distinctly pubescent basally.

pubescent;

ligules 0.2-0.5 mm;

blades 12-35 cm long, 10-24 mm wide, flat, scabrous, pubescent near the margins, margins usually undulate.

terminal, with 8-25 racemosely arranged branches;

branches 1-8 cm, divergent to erect;

branch axes 1-1.2 mm wide, margins scabrous, terminating in a spikelet;

pedicels 0.2-0.4 and 0.5-1.2 mm long, flattened, scabrous.

terminal, with 18-50 racemosely arranged branches;

branches 0.8-8.9 cm, spreading to diverging, often arcuate;

branch axes 0.2-0.5 mm wide, narrowly winged, scabrous, terminating in a spikelet.

1.8-2 mm, paired, appressed to or divergent from the branch axes, oblong-elliptic, white to stramineous.

1.1-1.3 mm long, 0.9-1 mm wide, paired, diverging from the branch axes, ovate, light brown to stramineous.

absent;

lower lemmas glabrous, ribbed over the veins, sulcate between, 5-veined, margins entire;

upper lemmas as long as the lower ones, longitudinally papillose-striate, glabrous, pale-colored.

absent;

upper glumes and lower lemmas pubescent, 3-veined;

upper florets 1.1-1.3 mm, stramineous.

0.7-0.8 mm, light brown.

florets white to stramineous.

= 40, 60.

= 20, 40, 60.