Flora of North America species comparison

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

nodes glabrous.

10-53 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 2-4.1 mm;

blades 5-25(80) cm long, 2.9-10.2(12) mm wide, flat.

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 1-5 racemosely arranged branches;

branches 1.1-5.4(7) cm, divergent;

branch axes 0.8-1.3 mm wide, not or narrowly winged, glabrous, 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.

2.1-2.6 mm long, 1.7-2.4 mm wide, paired, appressed to the branch axes, broadly obovate to suborbicular, shortly pubescent, light to dark brown.

1.9-2.1 mm, brown.

1.3-1.5 mm, white.

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 shortly pubescent, 5-7-veined, margins entire;

lower paleas rarely present;

upper florets dark glossy brown.

= 20, 40.

= 30,32,40,60.