Flora of North America species comparison

90-200 cm, erect;

nodes sunken, glabrous or pubescent, brown.

100-200 cm, stout, erect;

nodes glabrous.

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.

glabrous or sparsely pubescent;

ligules 1-2 mm, brown;

blades to 50 cm long, 7-18 mm wide, flat, glabrous or pubescent, margins scabrous, ciliate.

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 4-13 racemosely arranged branches;

branches 6-11 cm, diverging, divaricate, or reflexed;

branch axes 0.5-1(1.2) mm wide, winged, wings narrower than the central section, terminating in a spikelet.

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

2-2.7(3) mm long, 1.1-1.8 mm wide, paired, appressed to or diverging from the branch axes, elliptic to obovate, pubescent, brown.

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 densely short pubescent, hairs about 0.5 mm;

lower lemmas glabrous or sparsely short pubescent, margins entire;

upper florets 1.8-2.2 mm, pubescent, brown.

florets white to stramineous.

= 40, 60.

= 40, 60.