Flora of North America species comparison

(50)100-180 cm, erect;

nodes pubescent.

80-210 cm, erect;

nodes glabrous or pubescent.

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 1.2-3.3 mm;

blades to 52 cm long, 3-18 mm wide, flat, glabrous or pubescent, usually densely pubescent behind the ligules.

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, with 1-6 racemosely arranged branches;

branches 3-17.9 cm, divergent to erect, terminating in a spikelet;

branch axes 0.3-1.8 mm wide, glabrous, the margins scabrous.

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.

2.9-4.1 mm long, 1.9-3.1 mm wide, paired, imbricate, appressed to the branch axes, elliptic to suborbicular to orbicular, glabrous, 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.

absent;

upper glumes glabrous, 5-veined, margins entire;

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

upper florets golden brown.

2.8 mm, amber.

= 20, 30, 40.

= 120, 140, ca. 160-170.