Flora of North America species comparison

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

nodes glabrous.

to 100 cm, erect;

nodes pubescent.

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.

pubescent;

ligules 0.2-0.5 mm;

blades 12-35 cm long, 10-24 mm wide, flat, scabrous, pubescent near the margins, margins usually undulate.

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 18-50 racemosely arranged branches;

branches 0.8-8.9 cm, spreading to diverging, often arcuate;

branch axes 0.2-0.5 mm wide, narrowly winged, 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.

1.1-1.3 mm long, 0.9-1 mm wide, paired, diverging from the branch axes, ovate, light brown to stramineous.

1.9-2.1 mm, brown.

0.7-0.8 mm, light 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 pubescent, 3-veined;

upper florets 1.1-1.3 mm, stramineous.

= 20, 40.

= 20, 40, 60.