Flora of North America species comparison

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

nodes glabrous.

10-70 cm, erect to ascending;

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.

glabrous, pubescent apically;

ligules 1.2-1.5 mm;

blades 6-20 cm long, 4-5 mm wide, flat to conduplicate, glabrous or pubescent.

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 2-5 racemosely arranged branches;

branches 1.4-5.2 cm, divergent;

branch axes about 0.8 mm wide, 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.

2.3-2.7 mm long, 1.4-1.8 mm wide, paired, appressed to or divergent from the branch axes, elliptic, dark brown.

1.9-2.1 mm, brown.

about 1.8 mm long, 1.4 mm wide, ellipsoidal.

glumes absent;

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

upper florets white to light yellow.

glumes absent;

upper glumes shortly pubescent, 5-veined, margins entire;

lower lemmas transversely rugose at maturity, glabrous, 5-veined, margins entire;

upper florets dark glossy brown.

= 20, 40.

= 40.