Flora of North America species comparison

30-110 cm, stout, erect;

nodes glabrous.

10-79 cm, erect;

nodes glabrous.

glabrous;

ligules 2-3 mm;

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

glabrous, sparsely long pubescent distally;

ligules 1-2 mm;

blades 10-19 cm long, 1.4-8 mm wide, flat or conduplicate, glabrous or pubescent, apices involute.

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, usually composed of a digitate pair of branches, a third branch sometimes present below;

branches 1.1-7.9 cm, diverging to erect;

branch axes 0.4-1.4 mm wide, winged, glabrous, margins scabrous, terminating in a spikelet.

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

3-4.5 mm long, 1.1-2 mm wide, solitary, appressed to the branch axes, elliptic-lanceolate, glabrous, light stramineous, apices acute to acuminate.

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 (rarely present);

upper glumes and lower lemmas glabrous, 3-veined;

upper florets white.

1.4-1.6 mm, brown.

2.8-3.1 mm, yellow.

= 20, 40, 60.

= 20, 40, 60.