Flora of North America species comparison

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

nodes glabrous.

15-96 cm, erect or prostrate, often rooting at the lower nodes;

nodes glabrous.

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;

ligules 1-3.2 mm;

blades to 56 cm long, 2.2-15 mm wide, flat.

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, with 1-10(28) racemosely arranged branches;

branches 1.2-8.2 cm, diverging;

branch axes 0.7-2.3 mm wide, glabrous, broadly winged, wings about as wide as the central portion, margins scabrous, 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.

2-2.2 mm long, 1.3-1.8 mm wide, paired, appressed to the branch axes, glabrous, broadly elliptic, obovate, or orbicular, light to dark brown.

1.9-2.1 mm, brown.

1.4-1.6 mm, white.

glumes absent;

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

upper florets white to light yellow.

glumes absent;

upper glumes glabrous, 5-veined, margins entire;

lower lemmas glabrous, 3-5-veined, margins entire;

upper florets dark glossy brown.

= 20, 40.

= 40.