Flora of North America species comparison

15-80 cm, erect;

nodes glabrous.

100-200 cm, stout, erect;

nodes glabrous.

glabrous, pubescent distally;

ligules 0.5-0.8 mm;

blades 7-23 cm long, 1.5-8 mm wide, flat.

pubescent;

ligules 1.9-2.2 mm, brown;

blades 30-90 cm long, 1-3 cm wide, flat, glabrous, pubescent behind the ligules.

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

branches 2.5-12.7 cm, diverging to spreading, often arcuate, persistent;

branch axes 0.2-0.8 mm wide, glabrous, margins scabrous, terminating in a reduced spikelet.

terminal, with 10-20 racemosely arranged branches;

branches 3-15 cm, spreading to diverging;

branch axes 1-1.7 mm wide, winged, wings narrower than the central section, terminating in a spikelet.

1.3-1.9 mm long, 0.8-1.1 mm wide, solitary, appressed to the branch axes, ovate, stramineous.

2.2-3.2 mm long, 1.8-2.4 mm wide, paired, appressed to or diverging from the branch axes, obovate, brown.

absent;

upper glumes pilose on the margins, veinless or 2-3-veined;

lower lemmas glabrous, veinless or 2-3-veined;

upper florets whitish to golden yellow.

absent;

upper glumes and lower lemmas glabrous or variously short pubescent, 5-veined, margins entire;

upper florets 2.5-2.7 mm, brown.

0.9-1.1 mm, white to yellow.

= 18, 20, 40, 80.

= 36, 40, 54, 80.