Flora of North America species comparison

20-110 cm, erect;

nodes glabrous.

100-200 cm, stout, erect;

nodes glabrous.

glabrous or pubescent;

ligules 0.2-0.5 mm;

blades 5-31 cm long, 2-10 mm wide, flat or conduplicate, glabrous or pubescent.

pubescent;

ligules 1.9-2.2 mm, brown;

blades 30-90 cm long, 1-3 cm wide, flat, glabrous, pubescent behind the ligules.

terminal, usually composed of a digitate pair of branches, 1-3 additional branches sometimes present below the terminal pair;

branches 3-15 cm, diverging to erect;

branch axes 0.7-1.8 mm wide, narrowly winged, glabrous, margins scabrous, terminating in a spikelet, distal spikelets sometimes reduced.

terminal, with 10-20 racemosely arranged branches;

branches 3-15 cm, spreading to diverging;

branch axes 1-1.7 mm wide, winged, wings narrower than the central section, terminating in a spikelet.

2.5-4 mm long, 2-2.8 mm wide, solitary, appressed to the branch axes, broadly elliptic to ovate or obovate, glabrous, light stramineous to white, apices obtuse to broadly acute.

2.2-3.2 mm long, 1.8-2.4 mm wide, paired, appressed to or diverging from the branch axes, obovate, brown.

2-3 mm, white.

glumes absent;

upper glumes glabrous, 5-veined;

lower lemmas 5-veined, margins inrolled;

upper florets light yellow to white.

glumes absent;

upper glumes and lower lemmas glabrous or variously short pubescent, 5-veined, margins entire;

upper florets 2.5-2.7 mm, brown.

= 20, 30, 40.

= 36, 40, 54, 80.