Flora of North America species comparison

30-110 cm, stout, erect;

nodes glabrous.

80-110 cm, erect;

nodes glabrous.

glabrous;

ligules 2-3 mm;

blades to 35 cm long, 2-5.4 mm wide, conduplicate (rarely flat).

glabrous, sparsely pubescent apically;

ligules 1-2.9 mm;

blades to 62 cm long, 3-7 mm wide, mostly involute, pubescent above, glabrous below.

terminal, with 2-7 racemosely arranged branches;

branches 1.6-7.1 cm, usually divergent, rarely merely ascending;

branch axes 0.6-1.1 mm wide, glabrous, terminating in a spikelet.

terminal, with 3-15 racemosely arranged branches;

branches 5.2-12.5 cm, divergent to spreading, terminating in a spikelet;

branch axes 0.3-0.8 mm wide, very narrowly winged, scabrous.

2.5-3 mm long, 1.5-2.2 mm wide, paired, appressed to the branch axes, elliptic-ovate, light to dark brown.

2.2-2.5 mm long, 1-1.3 mm wide, paired, appressed to the branch axes, elliptic to obovate, white to light stramineous.

absent;

upper glumes usually with short, appressed pubescence, rarely glabrous, 5-veined, margins entire;

lower lemmas with short, appressed pubescence or glabrous, 3-veined, margins entire;

upper florets dark glossy brown.

absent;

upper glumes glabrous, 5-veined;

lower lemmas glabrous, 3-veined;

upper florets 1.4-2 mm, white to stramineous.

1.4-1.6 mm, brown.

1-1.6 mm, suborbicular, brown.

= 20, 40, 60.

= unknown.