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.

pubescent;

ligules 1.9-2.2 mm, brown;

blades 30-90 cm long, 1-3 cm wide, flat, glabrous, pubescent behind the ligules.

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 10-20 racemosely arranged branches;

branches 3-15 cm, spreading to diverging;

branch axes 1-1.7 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.

2.2-3.2 mm long, 1.8-2.4 mm wide, paired, appressed to or diverging from the branch axes, obovate, 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 and lower lemmas glabrous or variously short pubescent, 5-veined, margins entire;

upper florets 2.5-2.7 mm, brown.

= 20, 40.

= 36, 40, 54, 80.