Flora of North America species comparison

50-175 cm, erect;

nodes glabrous.

40-90 cm, erect;

nodes purple.

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;

ligules 0.1-0.3 mm;

blades 4-13 cm long, 10-22 mm wide, 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 40-75 racemosely arranged branches;

branches 1-2.5 cm, divergent to erect;

branch axes 1-1.5 mm wide, terminating in a pedicellate 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).

2.5-2.9 mm long, 0.8-1.2 mm wide, paired, appressed to or divergent from the branch axes, linear-elliptic, pubescent, stramineous or purplish.

absent;

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

upper florets stramineous.

absent;

upper glumes and lower lemmas rugose, shortly ciliate;

lower lemmas lacking ribs over the veins;

upper florets 1.3-1.6 mm, stramineous, oblong elliptic, pale, shiny.

2-2.3 mm, white to brown.

white.

= 20, 40, 50-63.

= unknown.