Flora of North America species comparison

10-150 cm, erect or decumbent;

nodes glabrous.

40-90 cm, erect;

nodes purple.

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.

glabrous;

ligules 0.1-0.3 mm;

blades 4-13 cm long, 10-22 mm wide, flat, glabrous.

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.

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.

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.

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 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.

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.

1.1-1.5 mm, nearly orbicular.

white.

= 20, 40, 60, 120.

= unknown.