Flora of North America species comparison

90-200 cm, erect;

nodes sunken, glabrous or pubescent, brown.

10-50 cm, erect.

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 0.5-2 mm;

blades to 20 cm long, 1.5-3.8 mm wide, flat, pubescent.

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, usually composed of a digitate pair of branches, 1-5 additional branches sometimes present below;

branches 1.8-7.1 cm, diverging to erect;

branch axes 0.8-1.3 mm wide, winged, terminating in a spikelet.

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

3-3.6 mm long, 1.3-1.8 mm wide, solitary (rarely paired), appressed to the branch axes, elliptic, glabrous, apices acute to acuminate.

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 glabrous, 5-veined, margins flat;

upper florets stramineous to golden brown.

florets white to stramineous.

= 40, 60.

= 12, 24, 36.