Flora of North America species comparison

to 15 cm, tip mostly rounded;

sheath not winged.

ovaries (1–)2–7-ovulate, utricular scale with narrow opening at apex.

0.6–1 mm, laterally winged.

with 8–16 distinct ribs, falling out of fruit wall after ripening.

white, thin, often decaying.

floating, 1 or 2–5 or more, coherent in groups, obovate, often gibbous, 1–8 mm, 1–1.5 times as long as wide, margins entire;

veins (3–)4–5(–7) (all originating from node), greatest distance between lateral veins near or distal to middle;

papillae often indistinct;

upper lower surface sometimes red colored, coloring beginning from margin, lower upper surface occasionally with distinct red spots beginning from margins near apex;

largest air spaces longer than 0.3 mm; distinct turions absent.

= 40, 42, 44, 50.