Flora of North America species comparison

5-65 cm, erect;

nodes glabrous.

23-125 cm, erect;

nodes glabrous or pubescent.

glabrous, sparsely long pubescent distally;

ligules 1-2 mm;

blades to 14 cm long, 1.8-11.5 mm wide, flat or conduplicate, glabrous or pubescent, apices involute.

glabrous or pubescent;

ligules 0.6-1.9 mm;

blades to 38 cm long, 4-18 mm wide, flat, glabrous or pubescent, dark green.

terminal, usually composed of a digitate pair of branches, a third branch sometimes present below;

branches 1.4-7 cm, diverging, often arcuate;

branch axes 1.2-2.2 mm wide, winged, glabrous, margins scabrous, terminating in a spikelet.

terminal, with 1-3(4) racemosely arranged branches;

branches 2.3-13.4 cm, erect to divergent, terminating in a spikelet;

branch axes 0.2-1 mm wide, glabrous, margins scabrous.

2.4-3.2 mm long, 1.1-1.6 mm wide, solitary (rarely paired), appressed to the branch axes, broadly elliptic, stramineous, sometimes partially purple.

2.1-3.3 mm long, 1.3-1.6 mm wide, paired, imbricate, appressed to the branch axes, elliptic to obovate, stramineous to brown.

absent or, if present, to 1 mm and triangular;

upper glumes sparsely and shortly pubescent on the back, 3-veined;

lower lemmas glabrous, 3-veined;

upper florets stramineous.

0.4-1.2(1.8) mm, stramineous to brown;

upper glumes with papillose-based short pubescence, 3- or 5-veined, margins entire, lower lemmas with papillose-based short pubescence, lacking ribs over the veins, 3-veined, margins entire;

upper florets light stramineous.

1.9-2.1 mm, yellow.

1.3-1.5 mm, light to dark brown.

= 20, 30, 40, 48, 60, 61.

= 40, 60.