Flora of North America species comparison

30-130 cm, decumbent;

nodes glabrous or pubescent.

60-120 cm, erect;

nodes glabrous.

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;

ligules 0.5-3 mm;

blades to 50 cm long, 0.2-2(8) mm wide, involute (rarely flat), glabrous, pubescent behind the ligules.

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, with 1-3 racemosely arranged branches;

branches 5.6-23.3 cm, erect (rarely divergent), terminating in a spikelet;

branch axes 0.5-1.2 mm wide, glabrous, margins scabrous to pubescent.

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.

2.3-3.7 mm long, 1.3-1.9 mm wide, paired, imbricate, appressed to the branch axes, elliptic to narrowly ovate, glabrous, stramineous (rarely partially purple).

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.

usually absent;

upper glumes glabrous, 1-veined, margins entire;

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

upper florets stramineous.

1.8-2 mm, golden brown or white.

2-2.4 mm, yellow to golden brown.

= 60, ca. 64.

= unknown.