Flora of North America species comparison

5-160 cm, erect, not rooting at the lower nodes;

nodes glabrous.

20-60 cm, erect, base swollen, bulblike;

cataphylls pubescent;

nodes sparsely pubescent or glabrous.

densely pubescent, occasionally glabrous;

ligules 1-2.2 mm;

blades to 55 cm long, 2.2-8.3 mm wide, conduplicate (occasionally flat), glabrous below, pubescent above.

pubescent or glabrous;

ligules 0.2-0.4 mm;

blades to 25 cm long, 1.9-6.2 mm wide, flat, glabrous, pubescent behind the ligules, margins scabrous, often ciliate basally.

terminal, with 2-10 racemosely arranged branches;

branches 0.8-10.3 cm, divergent to spreading, often arcuate, terminating in a spikelet;

branch axes 0.8-2 mm wide, narrowly winged, glabrous, margins scabrous.

terminal, with 2-5(8) racemosely arranged branches;

branches 0.9-4.4 cm, divergent to spreading, terminating in a spikelet;

branch axes 0.2-0.5 mm wide, narrowly winged.

2.1-3.1 mm long, 2-2.8 mm wide, paired, imbricate, appressed to divergent from the branch axes, orbicular to suborbicular, stramineous.

1.3-2 mm long, 0.7-1 mm wide, paired (rarely appearing solitary as a result of aborted spikelets), imbricate, appressed to the branch axes, elliptic.

1.9-2.1 mm, brown.

1.2-1.4 mm, ellipsoid, amber.

glumes absent;

upper glumes and lower lemmas glabrous, 3-veined, margins entire;

upper florets white to light yellow.

glumes absent;

upper glumes and lower lemmas glabrous or sparsely and shortly pubescent basally or around the margins, 5-veined, margins entire;

lower lemmas lacking ribs over the veins;

upper florets 1.3-1.8 mm, stramineous to golden brown.

= 20, 40.

= 40.