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.

pubescent;

ligules 1.9-2.2 mm, brown;

blades 30-90 cm long, 1-3 cm wide, flat, glabrous, pubescent behind the ligules.

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 10-20 racemosely arranged branches;

branches 3-15 cm, spreading to diverging;

branch axes 1-1.7 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).

2.2-3.2 mm long, 1.8-2.4 mm wide, paired, appressed to or diverging from the branch axes, obovate, brown.

absent;

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

upper florets stramineous.

absent;

upper glumes and lower lemmas glabrous or variously short pubescent, 5-veined, margins entire;

upper florets 2.5-2.7 mm, brown.

2-2.3 mm, white to brown.

= 20, 40, 50-63.

= 36, 40, 54, 80.