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 3.5 cm, tip usually sharp pointed;

sheath narrowly winged at base (wing 2–3 times as long as wide).

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

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

0.5–0.8 mm, not winged.

0.7–1 mm, not winged.

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

with 35–70 indistinct ribs, staying within fruit wall after ripening.

small, white, often decaying.

white, small, 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–few, coherent in groups, ovate-obovate, flat, 1–4 mm, 1–1.7 times as long as wide, margins entire;

veins 3, greatest distance between lateral veins near or distal to middle; 1 distinct papilla near apex on upper surface, 2–3 very distinct papillae above node;

anthocyanin absent, no reddish color;

air spaces much shorter than 0.3 mm; distinct turions absent.

= 40, 42, 50, 60, 80, 84.

= 40 (U), 42 (G).