Flora of North America species comparison

30-110 cm, stout, erect;

nodes glabrous.

60-120 cm, erect;

nodes glabrous.

glabrous;

ligules 2-3 mm;

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

glabrous;

ligules 0.5-3 mm;

blades to 50 cm long, 0.2-2(8) mm wide, involute (rarely flat), glabrous, pubescent behind the ligules.

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 1-3 racemosely arranged branches;

branches 5.6-23.3 cm, erect (rarely divergent), terminating in a spikelet;

branch axes 0.5-1.2 mm wide, glabrous, margins scabrous to pubescent.

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

2.3-3.7 mm long, 1.3-1.9 mm wide, paired, imbricate, appressed to the branch axes, elliptic to narrowly ovate, glabrous, stramineous (rarely partially purple).

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.

usually absent;

upper glumes glabrous, 1-veined, margins entire;

lower lemmas glabrous, lacking ribs over the veins, 3-veined, margins entire;

upper florets stramineous.

1.4-1.6 mm, brown.

2-2.4 mm, yellow to golden brown.

= 20, 40, 60.

= unknown.