Flora of North America species comparison

5-160 cm, erect, not rooting at the lower nodes;

nodes glabrous.

10-50 cm, erect.

densely pubescent, occasionally glabrous;

ligules 1-2.2 mm;

blades to 55 cm long, 2.2-8.3 mm wide, conduplicate (occasionally flat), glabrous below, pubescent above.

glabrous or sparsely pubescent;

ligules 0.5-2 mm;

blades to 20 cm long, 1.5-3.8 mm wide, flat, pubescent.

terminal, with 2-10 racemosely arranged branches;

branches 0.8-10.3 cm, divergent to spreading, often arcuate, terminating in a spikelet;

branch axes 0.8-2 mm wide, narrowly winged, glabrous, margins scabrous.

terminal, usually composed of a digitate pair of branches, 1-5 additional branches sometimes present below;

branches 1.8-7.1 cm, diverging to erect;

branch axes 0.8-1.3 mm wide, winged, terminating in a spikelet.

2.1-3.1 mm long, 2-2.8 mm wide, paired, imbricate, appressed to divergent from the branch axes, orbicular to suborbicular, stramineous.

3-3.6 mm long, 1.3-1.8 mm wide, solitary (rarely paired), appressed to the branch axes, elliptic, glabrous, apices acute to acuminate.

1.9-2.1 mm, brown.

glumes absent;

upper glumes and lower lemmas glabrous, 3-veined, margins entire;

upper florets white to light yellow.

glumes absent;

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

upper florets stramineous to golden brown.

= 20, 40.

= 12, 24, 36.