Flora of North America species comparison

to 3 cm;

tip usually sharp pointed;

sheath winged at base (wing 1–2.5 times as long as wide).

to 15 cm, tip mostly rounded;

sheath not winged.

ovaries 1-ovulate, utricular scale open on 1 side.

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

0.5–0.8 mm, not winged.

0.6–1 mm, laterally winged.

with 8–26 distinct ribs, falling out of fruit wall after ripening.

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

small, white, often decaying.

white, thin, often decaying.

floating, 1 or 2–few, coherent in groups, ovate-lanceolate, flat, 1–6 mm, 1–3 times as long as wide, margins entire;

veins 3, greatest distance between lateral veins near or proximal to middle; 1 often very distinct papilla near apex on upper surface and 1 above node;

anthocyanin absent, no reddish color;

largest air spaces much shorter than 0.3 mm; 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, 50, 60, 80, 84.

= 40, 42, 44, 50.