Flora of North America species comparison

60-140 cm, erect;

nodes glabrous.

to 100 cm, erect;

nodes pubescent.

pubescent;

ligules 2-4 mm;

blades to 37 cm long, 2.2-11 mm wide, flat.

pubescent;

ligules 0.2-0.5 mm;

blades 12-35 cm long, 10-24 mm wide, flat, scabrous, pubescent near the margins, margins usually undulate.

terminal, with 2-5 racemosely arranged branches;

branches 3.7-13 cm, divergent to erect;

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

terminal, with 18-50 racemosely arranged branches;

branches 0.8-8.9 cm, spreading to diverging, often arcuate;

branch axes 0.2-0.5 mm wide, narrowly winged, scabrous, terminating in a spikelet.

3.1-4 mm long, 2-2.5 mm wide, paired, not imbricate, appressed to the branch axes, elliptic to obovate, yellow-brown.

1.1-1.3 mm long, 0.9-1 mm wide, paired, diverging from the branch axes, ovate, light brown to stramineous.

present or absent;

upper glumes glabrous or sparsely pubescent basally, (6)7-veined, margins entire;

lower lemmas glabrous or sparsely pubescent basally, lacking ribs over the veins, 5-veined, margins entire;

upper florets white.

absent;

upper glumes and lower lemmas pubescent, 3-veined;

upper florets 1.1-1.3 mm, stramineous.

2.6-2.9 mm, purple.

0.7-0.8 mm, light brown.

= unknown.

= 20, 40, 60.