Flora of North America species comparison

50-175 cm, erect;

nodes glabrous.

100-200 cm, stout, 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 sparsely pubescent;

ligules 1-2 mm, brown;

blades to 50 cm long, 7-18 mm wide, flat, glabrous or pubescent, margins scabrous, ciliate.

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, with 4-13 racemosely arranged branches;

branches 6-11 cm, diverging, divaricate, or reflexed;

branch axes 0.5-1(1.2) mm wide, winged, wings narrower than the central section, 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).

2-2.7(3) mm long, 1.1-1.8 mm wide, paired, appressed to or diverging from the branch axes, elliptic to obovate, pubescent, brown.

absent;

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

upper florets stramineous.

absent;

upper glumes densely short pubescent, hairs about 0.5 mm;

lower lemmas glabrous or sparsely short pubescent, margins entire;

upper florets 1.8-2.2 mm, pubescent, brown.

2-2.3 mm, white to brown.

= 20, 40, 50-63.

= 40, 60.