Flora of North America species comparison

50-175 cm, erect;

nodes glabrous.

(50)100-180 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, margins extending into auricles;

ligules 1-6.3 mm;

blades 15-62 cm long, 4.9-6.1 mm wide, involute to flat, glabrous.

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 15-44 racemosely arranged branches;

branches 1.2-8.5 cm, straight, erect to ascending, lower branches longer than those above;

branch axes 0.5-0.6 mm wide, narrowly winged, glabrous, margins scabrous, pubescent, 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).

2-2.5(3) mm long, 0.9-1.3 mm wide, paired, divergent to spreading from the branch axes, elliptic, brown to stramineous, often purple-tinged.

absent;

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

upper florets stramineous.

usually absent, if present, to 0.9 mm, triangular;

upper glumes shortly pubescent, 3-veined, purple-spotted, margins entire;

lower lemmas glabrous or pubescent, lacking ribs over the veins, 3-veined, margins entire;

upper florets 2.2-2.5 mm, white.

2-2.3 mm, white to brown.

= 20, 40, 50-63.

= 20, 30, 40.