Flora of North America species comparison

30-110 cm, stout, erect;

nodes glabrous.

100-200 cm, stout, erect;

nodes glabrous.

glabrous;

ligules 2-3 mm;

blades to 35 cm long, 2-5.4 mm wide, conduplicate (rarely flat).

glabrous or sparsely pubescent;

ligules 1-2 mm, brown;

blades to 50 cm long, 7-18 mm wide, flat, glabrous or pubescent, margins scabrous, ciliate.

terminal, with 2-7 racemosely arranged branches;

branches 1.6-7.1 cm, usually divergent, rarely merely ascending;

branch axes 0.6-1.1 mm wide, glabrous, terminating in a spikelet.

terminal, with 4-13 racemosely arranged branches;

branches 6-11 cm, diverging, divaricate, or reflexed;

branch axes 0.5-1(1.2) mm wide, winged, wings narrower than the central section, terminating in a spikelet.

2.5-3 mm long, 1.5-2.2 mm wide, paired, appressed to the branch axes, elliptic-ovate, light to dark brown.

2-2.7(3) mm long, 1.1-1.8 mm wide, paired, appressed to or diverging from the branch axes, elliptic to obovate, pubescent, brown.

absent;

upper glumes usually with short, appressed pubescence, rarely glabrous, 5-veined, margins entire;

lower lemmas with short, appressed pubescence or glabrous, 3-veined, margins entire;

upper florets dark glossy brown.

absent;

upper glumes densely short pubescent, hairs about 0.5 mm;

lower lemmas glabrous or sparsely short pubescent, margins entire;

upper florets 1.8-2.2 mm, pubescent, brown.

1.4-1.6 mm, brown.

= 20, 40, 60.

= 40, 60.