Flora of North America species comparison

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

nodes glabrous.

15-80 cm, erect;

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, pubescent distally;

ligules 0.5-0.8 mm;

blades 7-23 cm long, 1.5-8 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, usually composed of a pair of branches, a third branch sometimes present below the terminal pair;

branches 2.5-12.7 cm, diverging to spreading, often arcuate, persistent;

branch axes 0.2-0.8 mm wide, glabrous, margins scabrous, terminating in a reduced 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.

1.3-1.9 mm long, 0.8-1.1 mm wide, solitary, appressed to the branch axes, ovate, stramineous.

1.9-2.1 mm, brown.

0.9-1.1 mm, white to yellow.

glumes absent;

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

upper florets white to light yellow.

glumes absent;

upper glumes pilose on the margins, veinless or 2-3-veined;

lower lemmas glabrous, veinless or 2-3-veined;

upper florets whitish to golden yellow.

= 20, 40.

= 18, 20, 40, 80.