Flora of North America species comparison

50-220 cm, erect;

nodes glabrous or pubescent.

50-80 cm, erect.

glabrous or pubescent;

ligules 1-4(7.7) mm;

blades 12-60 cm long, 2-12 mm wide, flat, mostly glabrous, a few long hairs near the base of the adaxial surface.

glabrous, pubescent apically, margins scarious;

ligules 1-2 mm, membranous, lacerate;

blades 3-4 mm wide, flat, glabrous, pubescent behind the ligules, margins papillose-ciliate.

terminal, with (4)10-30 racemosely arranged branches;

branches 1.2-11.5 cm, divergent;

branch axes 0.5-1.1 mm wide, winged, glabrous, margins scabrous, terminating in a spikelet.

terminal, erect, a spicate raceme 7-15 cm long, or a panicle with 1-2 subterminal spicate branches that are wholly or partially enclosed in the upper sheath, often arcuate;

branches terminating in a spikelet.

1.8-2.8 mm long, 1.1-1.5 mm wide, paired, appressed to the branch axes, elliptic to slightly obovate, stramineous (rarely purple).

2.7-3 mm, paired, imbricate, obovate, stramineous.

1.2-1.7 mm, white.

glumes absent;

upper glumes and lower lemmas 3-veined, margins pilose;

upper florets stramineous.

glumes absent, or 1-2.3 mm;

upper glumes and lower lemmas glabrous, 3-veined, margins entire;

lower lemma lacking ribs over the veins;

lower florets often staminate;

lower paleas 2.5-2.9 mm, membranous;

upper florets 2.3-2.9 mm, white, stramineous, or golden brown.

= 40.

= 40.