Flora of North America species comparison

40-120 cm, erect;

nodes glabrous or pubescent.

30-97 cm, erect;

nodes glabrous.

glabrous or pubescent;

ligules 1.5-3.8 mm;

blades to 37 cm long, 2-9.3 mm wide, flat, glabrous or pubescent.

glabrous or pubescent;

ligules 2.2-4.7 mm;

blades to 38 cm long, 2.3-6.2 mm wide, flat, glabrous or pubescent.

terminal, with 1-6 racemosely arranged branches;

branches 2-10.9 cm, diverging to spreading (rarely erect), persistent;

branch axes 0.6-1.3 mm wide, glabrous, margins scabrous, terminating in a spikelet.

terminal, with 3-11 racemosely arranged branches;

branches 1.5-4 cm, divergent, occasionally arcuate, terminating in a spikelet;

branch axes 1.5-2 mm wide, broadly winged, glabrous or sparsely pubescent, margins scabrous, usually slightly conduplicate, occasionally purple.

2.3-3.3 mm long, 2-2.7 mm wide, solitary, appressed to the branch axes, elliptic to obovate or nearly orbicular, glabrous, stramineous.

2.2-2.6 mm long, 1.2-1.5 mm wide, paired, imbricate, appressed to divergent from the branch axes, elliptic to obovate, stramineous (rarely purple-spotted), margins scabrous apically.

absent;

upper glumes 3-veined, lower lemmas 5-veined;

upper florets pale to stramineous.

absent;

upper glumes and lower lemmas glabrous, 5-veined, margins entire;

lower lemmas lacking ribs over the veins;

upper florets white to pale.

about 2 mm, white to yellow-brown.

2-2.2 mm, brown.

= 20, 58, 70, 80.

= 40, 60.