Flora of North America species comparison

5-65 cm, erect;

nodes glabrous.

30-110 cm, decumbent and rooting at the lower nodes;

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 1-2.3 mm;

blades to 50 cm long, 2-10 mm wide, flat, glabrous or pubescent.

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 2-6(10) racemosely arranged branches;

branches 3.5-12.5 cm, diverging to erect;

branch axes 1-2.1 mm wide, glabrous, terminating in a spikelet.

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.

2.5-3 mm long, 1.3-1.6 mm wide, paired, appressed to the branch axes, elliptic, light 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.

often present, 0.5-2 mm, brown;

upper glumes glabrous, 5-veined, margins entire, lower lemmas glabrous, 5-7-veined, margins entire;

upper florets olive, golden brown, or dark brown.

1.9-2.1 mm, yellow.

1.6-1.8 mm, brown.

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

= 20, 30, 40.