Flora of North America species comparison

90-200 cm, erect;

nodes sunken, glabrous or pubescent, brown.

40-120 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.

glabrous or pubescent;

ligules 1.5-3.8 mm;

blades to 37 cm long, 2-9.3 mm wide, flat, glabrous or 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, with 1-6 racemosely arranged branches;

branches 2-10.9 cm, diverging to spreading (rarely erect), persistent;

branch axes 0.6-1.3 mm wide, 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.

2.3-3.3 mm long, 2-2.7 mm wide, solitary, appressed to the branch axes, elliptic to obovate or nearly orbicular, glabrous, 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 3-veined, lower lemmas 5-veined;

upper florets pale to stramineous.

about 2 mm, white to yellow-brown.

florets white to stramineous.

= 40, 60.

= 20, 58, 70, 80.