Flora of North America species comparison

50-175 cm, erect;

nodes glabrous.

10-50 cm, erect.

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 sparsely pubescent;

ligules 0.5-2 mm;

blades to 20 cm long, 1.5-3.8 mm wide, flat, 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, 1-5 additional branches sometimes present below;

branches 1.8-7.1 cm, diverging to erect;

branch axes 0.8-1.3 mm wide, winged, 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).

3-3.6 mm long, 1.3-1.8 mm wide, solitary (rarely paired), appressed to the branch axes, elliptic, glabrous, apices acute to acuminate.

absent;

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

upper florets stramineous.

absent;

upper glumes and lower lemmas glabrous, 5-veined, margins flat;

upper florets stramineous to golden brown.

2-2.3 mm, white to brown.

= 20, 40, 50-63.

= 12, 24, 36.