Flora of North America species comparison

50-175 cm, erect;

nodes glabrous.

80-110 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, sparsely pubescent apically;

ligules 1-2.9 mm;

blades to 62 cm long, 3-7 mm wide, mostly involute, pubescent above, glabrous below.

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 3-15 racemosely arranged branches;

branches 5.2-12.5 cm, divergent to spreading, terminating in a spikelet;

branch axes 0.3-0.8 mm wide, very narrowly winged, scabrous.

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).

2.2-2.5 mm long, 1-1.3 mm wide, paired, appressed to the branch axes, elliptic to obovate, white to light stramineous.

absent;

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

upper florets stramineous.

absent;

upper glumes glabrous, 5-veined;

lower lemmas glabrous, 3-veined;

upper florets 1.4-2 mm, white to stramineous.

2-2.3 mm, white to brown.

1-1.6 mm, suborbicular, brown.

= 20, 40, 50-63.

= unknown.