Flora of North America species comparison

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

nodes glabrous.

30-110 cm, stout, 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;

ligules 2-3 mm;

blades to 35 cm long, 2-5.4 mm wide, conduplicate (rarely 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 2-7 racemosely arranged branches;

branches 1.6-7.1 cm, usually divergent, rarely merely ascending;

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.

2.5-3 mm long, 1.5-2.2 mm wide, paired, appressed to the branch axes, elliptic-ovate, light to dark brown.

1.9-2.1 mm, brown.

1.4-1.6 mm, brown.

glumes absent;

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

upper florets white to light yellow.

glumes absent;

upper glumes usually with short, appressed pubescence, rarely glabrous, 5-veined, margins entire;

lower lemmas with short, appressed pubescence or glabrous, 3-veined, margins entire;

upper florets dark glossy brown.

= 20, 40.

= 20, 40, 60.