Flora of North America species comparison

30-130 cm, decumbent;

nodes glabrous or pubescent.

to 200 cm, erect;

nodes glabrous.

glabrous or pubescent;

ligules 1-3.2 mm;

blades to 31 cm long, 4-18 mm wide, flat, glabrous, with a few hairs behind the ligules.

glabrous;

ligules 2-3 mm;

blades to 57 cm long, 2-3 cm wide, flat, glabrous below, appressed pubescent above.

terminal, with 2-7 racemosely arranged branches;

branches 2.2-7.9 cm, divergent to spreading, terminating in a spikelet;

branch axes 1.1-2.3 mm wide, narrowly winged, glabrous, margins scabrous.

terminal, with 60-100 racemosely arranged branches;

branches 1-13 cm, divergent to spreading, often arcuate;

branch axes 0.9-1.2 mm wide, winged, margins scabrous, long pubescent.

2.8-3.6 mm long, 1.5-2 mm wide, paired, imbricate, appressed to divergent from the branch axes, elliptic to obovate, pubescent or glabrous, light brown to stramineous.

2-2.4 mm long, 0.9-1.2 mm wide, paired, divergent to spreading from the branch axes, elliptic to ovate, glabrous or pubescent, stramineous, sometimes partially purple.

absent;

upper glumes and lower lemmas glabrous or sparsely pubescent, hairs shorter than 0.1 mm, 3-veined, margins entire;

lower lemmas lacking ribs over the veins;

upper florets stramineous.

absent;

upper glumes smooth, 3-veined, margins entire, sparsely short-pubescent, at least distally;

lower lemmas smooth, lacking ribs over the veins, 3-veined, margins entire, glabrous or shortly pubescent;

upper florets stramineous to white.

1.8-2 mm, golden brown or white.

1.5-1.7 mm, golden brown.

= 60, ca. 64.

= 20, 40.