Flora of North America species comparison

90-200 cm, erect;

nodes sunken, glabrous or pubescent, brown.

40-90 cm, erect;

nodes purple.

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 0.1-0.3 mm;

blades 4-13 cm long, 10-22 mm wide, flat, glabrous.

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 40-75 racemosely arranged branches;

branches 1-2.5 cm, divergent to erect;

branch axes 1-1.5 mm wide, terminating in a pedicellate spikelet.

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

2.5-2.9 mm long, 0.8-1.2 mm wide, paired, appressed to or divergent from the branch axes, linear-elliptic, pubescent, stramineous or purplish.

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 rugose, shortly ciliate;

lower lemmas lacking ribs over the veins;

upper florets 1.3-1.6 mm, stramineous, oblong elliptic, pale, shiny.

white.

florets white to stramineous.

= 40, 60.

= unknown.