Flora of North America species comparison

30-130 cm, decumbent;

nodes glabrous or pubescent.

50-120 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, sparsely pubescent apically;

ligules 2-5 mm;

blades to 21 cm long, 2-5 mm wide, flat, glabrous, pubescent behind the ligules, margins ciliate basally.

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 4-9 racemosely arranged branches;

branches 2-6.5 cm, divergent to erect, terminating in a spikelet;

branch axes 1.2-1.5 mm wide, winged, glabrous, margins scabrous.

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.

2.8-3 mm long, 1.5-1.6 mm wide, paired, imbricate, appressed to divergent from the branch axes, elliptic, stramineous.

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 and lower lemmas abundantly pubescent, hairs longer than 0.1 mm, 3-veined, margins entire;

lower lemmas lacking ribs over the veins;

upper florets 2.5-2.7 mm, white to stramineous.

1.8-2 mm, golden brown or white.

= 60, ca. 64.

= 60.