Flora of North America species comparison

50-175 cm, erect;

nodes glabrous.

10-70 cm, erect to ascending;

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, pubescent apically;

ligules 1.2-1.5 mm;

blades 6-20 cm long, 4-5 mm wide, flat to conduplicate, glabrous or 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, with 2-5 racemosely arranged branches;

branches 1.4-5.2 cm, divergent;

branch axes about 0.8 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).

2.3-2.7 mm long, 1.4-1.8 mm wide, paired, appressed to or divergent from the branch axes, elliptic, dark brown.

absent;

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

upper florets stramineous.

absent;

upper glumes shortly pubescent, 5-veined, margins entire;

lower lemmas transversely rugose at maturity, glabrous, 5-veined, margins entire;

upper florets dark glossy brown.

2-2.3 mm, white to brown.

about 1.8 mm long, 1.4 mm wide, ellipsoidal.

= 20, 40, 50-63.

= 40.