Flora of North America species comparison

50-220 cm, erect;

nodes glabrous or pubescent.

15-70 cm, erect;

nodes glabrous or pubescent.

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.

pubescent, sometimes sparsely so;

ligules 1-1.9 mm;

blades to 35 cm long, 1.9-16.2 mm wide, flat, sparsely pubescent on both surfaces, margins ciliate basally.

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 2-8 racemosely arranged branches;

branches 2-6.4 cm, diverging to erect;

branch axes 0.9-1.6 mm wide, winged, glabrous, margins scabrous, 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).

2.5-3.5 mm long, 2.4-3 mm wide, paired, appressed to the branch axes, suborbicular, stramineous.

1.2-1.7 mm, white.

0.9-1.1 mm, orbicular, white.

glumes absent;

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

upper florets stramineous.

glumes absent;

upper glumes and lower lemmas 1.9-2.1 mm, ovate, winged, 1-veined, margins ciliate-lacerate;

upper florets 1.7-1.9 mm, stramineous.

= 40.

= 20.