Flora of North America species comparison

50-175 cm, erect;

nodes glabrous.

3-60 cm, erect;

nodes glabrous.

glabrous or pubescent, lower sheaths more frequently pubescent than the upper sheaths;

ligules 1.5-3.8 mm;

blades to 35 cm long, 2-16.5 mm wide, flat, mostly glabrous, adaxial surfaces with a few long hairs near the base.

glabrous or pubescent;

ligules 0.2-0.7 mm;

blades 8-18 cm long, 2-7.1 mm wide, flat, glabrous or pubescent.

terminal, with 2-7 racemosely arranged branches;

branches 1.5-12 cm, racemose, divergent;

branch axes 0.7-1.4 mm wide, winged, glabrous, margins scabrous, terminating in a spikelet.

terminal, usually composed of a digitate pair of branches, a third branch sometimes present below the terminal pair;

branches 1.8-6.4 cm, diverging to erect;

branch axes 0.5-1.3 mm wide, narrowly winged, glabrous, margins scabrous, terminating in a spikelet.

2.3-4 mm long, 1.7-2.5 mm wide, paired, appressed to the branch axes, ovate, tapering to an acute apex, stramineous (rarely purple).

1.9-2.3 mm long, 1.2-2 mm wide, solitary, appressed to the branch axes, broadly elliptic to ovate to obovate, glabrous, stramineous, apices obtuse.

absent;

upper glumes and lower lemmas 5-7-veined, margins pilose;

upper florets stramineous.

absent;

upper glumes 3-veined, lower lemmas faintly 3-veined;

upper florets stramineous.

2-2.3 mm, white to brown.

1.8-2.2 mm, white.

= 20, 40, 50-63.

= 20, 40, 50.