Flora of North America species comparison

50-175 cm, erect;

nodes glabrous.

to 100 cm, erect;

nodes pubescent.

glabrous or pubescent, lower sheaths more frequently pubescent than the upper sheaths;

ligules 1.5-3.8 mm;

blades to 35 cm long, 2-16.5 mm wide, flat, mostly glabrous, adaxial surfaces with a few long hairs near the base.

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 2-7 racemosely arranged branches;

branches 1.5-12 cm, racemose, divergent;

branch axes 0.7-1.4 mm wide, winged, 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.

2.3-4 mm long, 1.7-2.5 mm wide, paired, appressed to the branch axes, ovate, tapering to an acute apex, stramineous (rarely purple).

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

absent;

upper glumes and lower lemmas 5-7-veined, margins pilose;

upper florets stramineous.

absent;

upper glumes and lower lemmas pubescent, 3-veined;

upper florets 1.1-1.3 mm, stramineous.

2-2.3 mm, white to brown.

0.7-0.8 mm, light brown.

= 20, 40, 50-63.

= 20, 40, 60.