Flora of North America species comparison

to 15 cm, tip mostly rounded;

sheath not winged.

to 15 cm, tip mostly rounded;

sheath not winged.

ovaries 1-ovulate, utricular scale with narrow opening at apex.

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

0.8–1 mm, laterally winged toward apex.

0.6–1 mm, laterally winged.

with 8–15 distinct ribs, staying within fruit wall after ripening.

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

white, small, often decaying.

white, thin, often decaying.

floating, 1 or 2–5 or more, coherent in groups, ovate, scarcely gibbous, flat, 1–8 mm, 1.3–2 times as long as wide, margins entire;

veins 3(–5) (if more than 3, outer ones branching from inner ones), greatest distance between lateral veins near or proximal to middle;

papillae not always distinct (one near apex usually larger);

lower surface very seldom slightly reddish (much less than on upper), coloring beginning from attachment point of root, upper surface occasionally diffusely reddish;

air spaces 0.3 mm or shorter; distinct turions absent.

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 (B), 50, 63, 126.

= 40, 42, 44, 50.