Flora of North America species comparison

50-220 cm, erect;

nodes glabrous or pubescent.

to 200 cm, erect;

nodes glabrous.

glabrous or pubescent;

ligules 1-4(7.7) mm;

blades 12-60 cm long, 2-12 mm wide, flat, mostly glabrous, a few long hairs near the base of the adaxial surface.

glabrous;

ligules 2-3 mm;

blades to 57 cm long, 2-3 cm wide, flat, glabrous below, appressed pubescent above.

terminal, with (4)10-30 racemosely arranged branches;

branches 1.2-11.5 cm, divergent;

branch axes 0.5-1.1 mm wide, winged, glabrous, margins scabrous, terminating in a spikelet.

terminal, with 60-100 racemosely arranged branches;

branches 1-13 cm, divergent to spreading, often arcuate;

branch axes 0.9-1.2 mm wide, winged, margins scabrous, long pubescent.

1.8-2.8 mm long, 1.1-1.5 mm wide, paired, appressed to the branch axes, elliptic to slightly obovate, stramineous (rarely purple).

2-2.4 mm long, 0.9-1.2 mm wide, paired, divergent to spreading from the branch axes, elliptic to ovate, glabrous or pubescent, stramineous, sometimes partially purple.

1.2-1.7 mm, white.

1.5-1.7 mm, golden brown.

glumes absent;

upper glumes and lower lemmas 3-veined, margins pilose;

upper florets stramineous.

glumes absent;

upper glumes smooth, 3-veined, margins entire, sparsely short-pubescent, at least distally;

lower lemmas smooth, lacking ribs over the veins, 3-veined, margins entire, glabrous or shortly pubescent;

upper florets stramineous to white.

= 40.

= 20, 40.