Flora of North America species comparison

90-200 cm, erect;

nodes sunken, glabrous or pubescent, brown.

15-96 cm, erect or prostrate, often rooting at the lower nodes;

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;

ligules 1-3.2 mm;

blades to 56 cm long, 2.2-15 mm wide, flat.

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 1-10(28) racemosely arranged branches;

branches 1.2-8.2 cm, diverging;

branch axes 0.7-2.3 mm wide, glabrous, broadly winged, wings about as wide as the central portion, margins scabrous, terminating in a spikelet.

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

2-2.2 mm long, 1.3-1.8 mm wide, paired, appressed to the branch axes, glabrous, broadly elliptic, obovate, or orbicular, light to dark 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 glabrous, 5-veined, margins entire;

lower lemmas glabrous, 3-5-veined, margins entire;

upper florets dark glossy brown.

1.4-1.6 mm, white.

florets white to stramineous.

= 40, 60.

= 40.