Flora of North America species comparison

30-130 cm, decumbent;

nodes glabrous or pubescent.

10-150 cm, erect or decumbent;

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 0.3-1.2 mm, often with a row of hairs behind them;

blades 5-30 cm long, 2-8(12) mm wide, flat, usually glabrous.

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 1-5 digitately or racemosely arranged branches;

branches 3-10 cm, diverging to spreading, persistent;

branch axes 1.5-3 mm wide, broadly winged, glabrous, margins scabrous, 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.

1.8-3.2 mm long, 2-2.3 mm wide, solitary, diverging from the branch axes, ovate, glabrous, olive green to dark, glossy brown.

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;

upper glumes as long as the lower lemmas, 5-7-veined;

lower lemmas 3-5-veined;

upper florets 2.5-3 mm long, 1.4-1.8 mm wide, dark glossy brown.

1.8-2 mm, golden brown or white.

1.1-1.5 mm, nearly orbicular.

= 60, ca. 64.

= 20, 40, 60, 120.