Flora of North America species comparison

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

nodes glabrous.

23-125 cm, erect;

nodes glabrous or 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.

glabrous or pubescent;

ligules 0.6-1.9 mm;

blades to 38 cm long, 4-18 mm wide, flat, glabrous or pubescent, dark green.

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(4) racemosely arranged branches;

branches 2.3-13.4 cm, erect to divergent, terminating in a spikelet;

branch axes 0.2-1 mm wide, glabrous, margins scabrous.

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

2.1-3.3 mm long, 1.3-1.6 mm wide, paired, imbricate, appressed to the branch axes, elliptic to obovate, stramineous to brown.

1.9-2.1 mm, brown.

1.3-1.5 mm, light to dark brown.

glumes absent;

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

upper florets white to light yellow.

glumes 0.4-1.2(1.8) mm, stramineous to brown;

upper glumes with papillose-based short pubescence, 3- or 5-veined, margins entire, lower lemmas with papillose-based short pubescence, lacking ribs over the veins, 3-veined, margins entire;

upper florets light stramineous.

= 20, 40.

= 40, 60.