Flora of North America species comparison

50-220 cm, erect;

nodes glabrous or pubescent.

30-110 cm, decumbent and rooting at the lower nodes;

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 1-2.3 mm;

blades to 50 cm long, 2-10 mm wide, flat, glabrous or pubescent.

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 2-6(10) racemosely arranged branches;

branches 3.5-12.5 cm, diverging to erect;

branch axes 1-2.1 mm wide, glabrous, terminating in a spikelet.

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).

2.5-3 mm long, 1.3-1.6 mm wide, paired, appressed to the branch axes, elliptic, light brown.

1.2-1.7 mm, white.

1.6-1.8 mm, brown.

glumes absent;

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

upper florets stramineous.

glumes often present, 0.5-2 mm, brown;

upper glumes glabrous, 5-veined, margins entire, lower lemmas glabrous, 5-7-veined, margins entire;

upper florets olive, golden brown, or dark brown.

= 40.

= 20, 30, 40.