Flora of North America species comparison

4-55 cm, erect;

nodes pubescent.

65-400 cm, erect;

nodes pilose.

glabrous or pubescent;

ligules 1-4 mm;

blades 10-40 cm long, 8-22 mm wide, flat, glabrous or sparsely pubescent.

papillose-hirsute (upper sheaths sometimes glabrous);

ligules 1-4.5 mm;

blades 30-50 cm long, 10-23 mm wide, flat, with long hairs behind the ligules, otherwise glabrous or puberulent adaxially.

terminal, with (7)20-70 racemosely arranged branches;

branches 1.2-9.5 cm, diverging to spreading, occasionally arcuate, disarticulating at maturity;

branch axes 0.7-1.5 mm wide, broadly winged, glabrous, margins scabrous, extending beyond the distal spikelet.

terminal, with (6)15-44 racemosely arranged branches;

branches 5-13 cm, straight, spreading to reflexed, rarely merely divergent;

branch axes 0.3-0.4 mm wide, narrowly winged, glabrous, margins scabrous, pubescent, terminating in a spikelet.

1.1-1.9 mm long, 0.5-0.8 mm wide, solitary, appressed to the branch axes, elliptic, pubescent, white.

2-2.5 mm long, 1.8-1.9 mm wide, paired, divergent to spreading from the branch axes, elliptic, brown to stramineous, often purple-tinged.

absent;

upper glumes and lower lemmas veinless;

upper florets white.

usually absent, if present, to 0.9 mm, triangular;

upper glumes smooth, papillose-hirsute, 3-veined;

lower lemmas smooth, papillose-hirsute or glabrous, 3-veined;

upper florets white.

0.8-0.9 mm, translucent, white.

= 20.

= 20, 40, 60.