Flora of North America species comparison

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

nodes glabrous.

80-150 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 or sparsely pubescent;

ligules 1-3 mm;

blades to 35 cm long, 2-7 mm wide, flat, glabrous above, pubescent below, especially basally.

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 5-8 racemosely arranged branches;

branches 3.5-11 cm, divergent to erect;

branch axes 0.6-1.1 mm wide, glabrous, 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.

2.2-2.7 mm long, 1-1.4 mm wide, paired, appressed to or divergent from the branch axes, elliptic, glabrous, light brown.

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 glabrous, 3-veined;

lower lemmas glabrous, 5-veined;

upper florets glossy chestnut brown.

= 20, 40.

= unknown.