Flora of North America species comparison

30-110 cm, stout, erect;

nodes glabrous.

50-120 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 2-5 mm;

blades to 21 cm long, 2-5 mm wide, flat, glabrous, pubescent behind the ligules, margins ciliate basally.

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 4-9 racemosely arranged branches;

branches 2-6.5 cm, divergent to erect, terminating in a spikelet;

branch axes 1.2-1.5 mm wide, winged, glabrous, margins scabrous.

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

2.8-3 mm long, 1.5-1.6 mm wide, paired, imbricate, appressed to divergent from the branch axes, elliptic, 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 and lower lemmas abundantly pubescent, hairs longer than 0.1 mm, 3-veined, margins entire;

lower lemmas lacking ribs over the veins;

upper florets 2.5-2.7 mm, white to stramineous.

1.4-1.6 mm, brown.

= 20, 40, 60.

= 60.