Flora of North America species comparison

30-130 cm, decumbent;

nodes glabrous or pubescent.

50-80 cm, erect.

glabrous or pubescent;

ligules 1-3.2 mm;

blades to 31 cm long, 4-18 mm wide, flat, glabrous, with a few hairs behind the ligules.

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 2-7 racemosely arranged branches;

branches 2.2-7.9 cm, divergent to spreading, terminating in a spikelet;

branch axes 1.1-2.3 mm wide, narrowly winged, glabrous, margins scabrous.

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.

2.8-3.6 mm long, 1.5-2 mm wide, paired, imbricate, appressed to divergent from the branch axes, elliptic to obovate, pubescent or glabrous, light brown to stramineous.

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

absent;

upper glumes and lower lemmas glabrous or sparsely pubescent, hairs shorter than 0.1 mm, 3-veined, margins entire;

lower lemmas lacking ribs over the veins;

upper florets stramineous.

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.

1.8-2 mm, golden brown or white.

= 60, ca. 64.

= 40.