Flora of North America species comparison

90-200 cm, erect;

nodes sunken, glabrous or pubescent, brown.

15-70 cm, erect;

nodes glabrous or 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, sometimes sparsely so;

ligules 1-1.9 mm;

blades to 35 cm long, 1.9-16.2 mm wide, flat, sparsely pubescent on both surfaces, margins ciliate basally.

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 2-8 racemosely arranged branches;

branches 2-6.4 cm, diverging to erect;

branch axes 0.9-1.6 mm wide, winged, glabrous, margins scabrous, terminating in a spikelet.

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

2.5-3.5 mm long, 2.4-3 mm wide, paired, appressed to the branch axes, suborbicular, 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 1.9-2.1 mm, ovate, winged, 1-veined, margins ciliate-lacerate;

upper florets 1.7-1.9 mm, stramineous.

0.9-1.1 mm, orbicular, white.

florets white to stramineous.

= 40, 60.

= 20.