Flora of North America species comparison

5-160 cm, erect, not rooting at the lower nodes;

nodes glabrous.

100-200 cm, stout, erect;

nodes glabrous.

densely pubescent, occasionally glabrous;

ligules 1-2.2 mm;

blades to 55 cm long, 2.2-8.3 mm wide, conduplicate (occasionally flat), glabrous below, pubescent above.

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 2-10 racemosely arranged branches;

branches 0.8-10.3 cm, divergent to spreading, often arcuate, terminating in a spikelet;

branch axes 0.8-2 mm wide, narrowly winged, glabrous, margins 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.

2.1-3.1 mm long, 2-2.8 mm wide, paired, imbricate, appressed to divergent from the branch axes, orbicular to suborbicular, 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.

1.9-2.1 mm, brown.

glumes absent;

upper glumes and lower lemmas glabrous, 3-veined, margins entire;

upper florets white to light yellow.

glumes 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.

= 20, 40.

= 40, 60.