Flora of North America species comparison

50-175 cm, erect;

nodes glabrous.

30-110 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;

ligules 2-3 mm;

blades to 35 cm long, 2-5.4 mm wide, conduplicate (rarely flat).

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 2-7 racemosely arranged branches;

branches 1.6-7.1 cm, usually divergent, rarely merely ascending;

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).

2.5-3 mm long, 1.5-2.2 mm wide, paired, appressed to the branch axes, elliptic-ovate, light to dark brown.

absent;

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

upper florets stramineous.

absent;

upper glumes usually with short, appressed pubescence, rarely glabrous, 5-veined, margins entire;

lower lemmas with short, appressed pubescence or glabrous, 3-veined, margins entire;

upper florets dark glossy brown.

2-2.3 mm, white to brown.

1.4-1.6 mm, brown.

= 20, 40, 50-63.

= 20, 40, 60.