Flora of North America species comparison

30-130 cm, decumbent;

nodes glabrous or pubescent.

(50)100-180 cm, erect;

nodes pubescent.

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.

pubescent, margins extending into auricles;

ligules 1-6.3 mm;

blades 15-62 cm long, 4.9-6.1 mm wide, involute to flat, glabrous.

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 15-44 racemosely arranged branches;

branches 1.2-8.5 cm, straight, erect to ascending, lower branches longer than those above;

branch axes 0.5-0.6 mm wide, narrowly winged, glabrous, margins scabrous, pubescent, terminating in a spikelet.

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.

2-2.5(3) mm long, 0.9-1.3 mm wide, paired, divergent to spreading from the branch axes, elliptic, brown to stramineous, often purple-tinged.

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.

usually absent, if present, to 0.9 mm, triangular;

upper glumes shortly pubescent, 3-veined, purple-spotted, margins entire;

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

upper florets 2.2-2.5 mm, white.

1.8-2 mm, golden brown or white.

= 60, ca. 64.

= 20, 30, 40.