Flora of North America species comparison

50-220 cm, erect;

nodes glabrous or pubescent.

80-110 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, sparsely pubescent apically;

ligules 1-2.9 mm;

blades to 62 cm long, 3-7 mm wide, mostly involute, pubescent above, glabrous below.

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 3-15 racemosely arranged branches;

branches 5.2-12.5 cm, divergent to spreading, terminating in a spikelet;

branch axes 0.3-0.8 mm wide, very narrowly winged, scabrous.

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).

2.2-2.5 mm long, 1-1.3 mm wide, paired, appressed to the branch axes, elliptic to obovate, white to light stramineous.

1.2-1.7 mm, white.

1-1.6 mm, suborbicular, brown.

glumes absent;

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

upper florets stramineous.

glumes absent;

upper glumes glabrous, 5-veined;

lower lemmas glabrous, 3-veined;

upper florets 1.4-2 mm, white to stramineous.

= 40.

= unknown.