Flora of North America species comparison

50-175 cm, erect;

nodes glabrous.

15-80 cm, erect;

nodes glabrous.

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.

glabrous, pubescent distally;

ligules 0.5-0.8 mm;

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

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, 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.

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).

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

absent;

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

upper florets stramineous.

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.

2-2.3 mm, white to brown.

0.9-1.1 mm, white to yellow.

= 20, 40, 50-63.

= 18, 20, 40, 80.