Flora of North America species comparison

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

nodes glabrous.

40-75 cm, erect, not swollen at the base;

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;

blades to 15 cm long, 5-10 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, with 3-8 racemosely arranged branches;

branches 2-7 cm, spreading, terminating in a spikelet;

branch axes narrow, sparsely pubescent.

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

2-2.5 mm long, 1.4-1.6 mm wide, paired, imbricate, appressed to the branch axes, ovate.

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 shortly pubescent, 3-veined, margins entire;

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

upper florets pale to stramineous or golden brown.

= 20, 40.

= unknown.