Flora of North America species comparison

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

nodes glabrous.

60-120 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;

ligules 0.5-3 mm;

blades to 50 cm long, 0.2-2(8) mm wide, involute (rarely flat), glabrous, pubescent behind the ligules.

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 1-3 racemosely arranged branches;

branches 5.6-23.3 cm, erect (rarely divergent), terminating in a spikelet;

branch axes 0.5-1.2 mm wide, glabrous, margins scabrous to 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.

2.3-3.7 mm long, 1.3-1.9 mm wide, paired, imbricate, appressed to the branch axes, elliptic to narrowly ovate, glabrous, stramineous (rarely partially purple).

1.9-2.1 mm, brown.

2-2.4 mm, yellow to golden brown.

glumes absent;

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

upper florets white to light yellow.

glumes usually absent;

upper glumes glabrous, 1-veined, margins entire;

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

upper florets stramineous.

= 20, 40.

= unknown.