Flora of North America species comparison

5-160 cm, erect, not rooting at the lower nodes;

nodes glabrous.

40-100 cm, erect;

nodes glabrous.

densely pubescent, occasionally glabrous;

ligules 1-2.2 mm;

blades to 55 cm long, 2.2-8.3 mm wide, conduplicate (occasionally flat), glabrous below, pubescent above.

pubescent or glabrous;

ligules 0.2-0.4 mm;

blades 5-27 cm long, 1.9-8 mm wide, flat, glabrous, pubescent behind the ligules, margins scabrous, often ciliate basally.

terminal, with 2-10 racemosely arranged branches;

branches 0.8-10.3 cm, divergent to spreading, often arcuate, terminating in a spikelet;

branch axes 0.8-2 mm wide, narrowly winged, glabrous, margins scabrous.

terminal, with 2-6 racemosely arranged branches;

branches 1.5-7.5 cm, diverging to spreading;

branch axes 0.5-0.8 mm wide, narrowly winged, terminating in a spikelet.

2.1-3.1 mm long, 2-2.8 mm wide, paired, imbricate, appressed to divergent from the branch axes, orbicular to suborbicular, stramineous.

1-1.3 mm long, 0.7-0.9 mm wide, paired, appressed to the branch axes, elliptic to elliptic-obovate, glandular pubescent, stramineous to light or golden brown.

1.9-2.1 mm, brown.

0.9-1.1 mm in diameter, orbicular, amber.

glumes absent;

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

upper florets white to light yellow.

glumes absent;

upper glumes and lower lemmas 3-veined;

upper florets 0.8-1.1 mm, stramineous.

= 20, 40.

= 40.