Flora of North America species comparison

(50)100-180 cm, erect;

nodes pubescent.

3-60 cm, erect;

nodes glabrous.

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.

glabrous or pubescent;

ligules 0.2-0.7 mm;

blades 8-18 cm long, 2-7.1 mm wide, flat, glabrous or pubescent.

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.

terminal, usually composed of a digitate pair of branches, a third branch sometimes present below the terminal pair;

branches 1.8-6.4 cm, diverging to erect;

branch axes 0.5-1.3 mm wide, narrowly winged, glabrous, margins scabrous, terminating in a spikelet.

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.

1.9-2.3 mm long, 1.2-2 mm wide, solitary, appressed to the branch axes, broadly elliptic to ovate to obovate, glabrous, stramineous, apices obtuse.

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.

absent;

upper glumes 3-veined, lower lemmas faintly 3-veined;

upper florets stramineous.

1.8-2.2 mm, white.

= 20, 30, 40.

= 20, 40, 50.