Flora of North America species comparison

5-65 cm, erect;

nodes glabrous.

80-110 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, sparsely pubescent apically;

ligules 1-2.9 mm;

blades 9-41 cm long, 3-7 mm wide, mostly involute, pubescent above, glabrous below.

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 1-5(10) racemosely arranged branches;

branches 1.9-11.4 cm, erect to divergent, terminating in a spikelet;

branch axes 0.4-0.7 mm wide, very narrowly winged, 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.

1.6-2.2 mm long, 1.1-1.3 mm wide, paired, imbricate, appressed to the branch axes, elliptic-obovate to ovate.

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 shortly pubescent, 5-veined, margins entire;

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

upper florets 1.4-2 mm, white to stramineous.

1.9-2.1 mm, yellow.

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

= 60.