Flora of North America species comparison

50-175 cm, erect;

nodes glabrous.

80-150 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 sparsely pubescent;

ligules 1-3 mm;

blades to 35 cm long, 2-7 mm wide, flat, glabrous above, pubescent below, especially basally.

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 5-8 racemosely arranged branches;

branches 3.5-11 cm, divergent to erect;

branch axes 0.6-1.1 mm wide, glabrous, 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).

2.2-2.7 mm long, 1-1.4 mm wide, paired, appressed to or divergent from the branch axes, elliptic, glabrous, light brown.

absent;

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

upper florets stramineous.

absent;

upper glumes glabrous, 3-veined;

lower lemmas glabrous, 5-veined;

upper florets glossy chestnut brown.

2-2.3 mm, white to brown.

= 20, 40, 50-63.

= unknown.