Flora of North America species comparison

5-65 cm, erect;

nodes glabrous.

40-75 cm, erect, not swollen at the base;

nodes pubescent.

glabrous, sparsely long pubescent distally;

ligules 1-2 mm;

blades to 14 cm long, 1.8-11.5 mm wide, flat or conduplicate, glabrous or pubescent, apices involute.

pubescent;

blades to 15 cm long, 5-10 mm wide, flat, pubescent.

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

branches 1.4-7 cm, diverging, often arcuate;

branch axes 1.2-2.2 mm wide, winged, glabrous, margins scabrous, terminating in a spikelet.

terminal, with 3-8 racemosely arranged branches;

branches 2-7 cm, spreading, terminating in a spikelet;

branch axes narrow, sparsely pubescent.

2.4-3.2 mm long, 1.1-1.6 mm wide, solitary (rarely paired), appressed to the branch axes, broadly elliptic, stramineous, sometimes partially purple.

2-2.5 mm long, 1.4-1.6 mm wide, paired, imbricate, appressed to the branch axes, ovate.

absent or, if present, to 1 mm and triangular;

upper glumes sparsely and shortly pubescent on the back, 3-veined;

lower lemmas glabrous, 3-veined;

upper florets stramineous.

absent;

upper glumes shortly pubescent, 3-veined, margins entire;

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

upper florets pale to stramineous or golden brown.

1.9-2.1 mm, yellow.

= 20, 30, 40, 48, 60, 61.

= unknown.