Flora of North America species comparison

5-65 cm, erect;

nodes glabrous.

to 200 cm, erect;

nodes glabrous.

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;

ligules 2-3 mm;

blades to 57 cm long, 2-3 cm wide, flat, glabrous below, appressed pubescent above.

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 60-100 racemosely arranged branches;

branches 1-13 cm, divergent to spreading, often arcuate;

branch axes 0.9-1.2 mm wide, winged, margins scabrous, long pubescent.

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.

2-2.4 mm long, 0.9-1.2 mm wide, paired, divergent to spreading from the branch axes, elliptic to ovate, glabrous or pubescent, stramineous, sometimes partially purple.

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.

absent;

upper glumes smooth, 3-veined, margins entire, sparsely short-pubescent, at least distally;

lower lemmas smooth, lacking ribs over the veins, 3-veined, margins entire, glabrous or shortly pubescent;

upper florets stramineous to white.

1.9-2.1 mm, yellow.

1.5-1.7 mm, golden brown.

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

= 20, 40.