Flora of North America species comparison

50-175 cm, erect;

nodes glabrous.

60-120 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;

ligules 0.5-3 mm;

blades to 50 cm long, 0.2-2(8) mm wide, involute (rarely 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 1-3 racemosely arranged branches;

branches 5.6-23.3 cm, erect (rarely divergent), terminating in a spikelet;

branch axes 0.5-1.2 mm wide, glabrous, margins scabrous to pubescent.

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).

2.3-3.7 mm long, 1.3-1.9 mm wide, paired, imbricate, appressed to the branch axes, elliptic to narrowly ovate, glabrous, stramineous (rarely partially purple).

absent;

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

upper florets stramineous.

usually absent;

upper glumes glabrous, 1-veined, margins entire;

lower lemmas glabrous, lacking ribs over the veins, 3-veined, margins entire;

upper florets stramineous.

2-2.3 mm, white to brown.

2-2.4 mm, yellow to golden brown.

= 20, 40, 50-63.

= unknown.