Flora of North America species comparison

shorter than 15 cm, tip mostly rounded;

sheath not winged.

to 1.5 cm, tip rounded to pointed;

sheath not winged.

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

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

0.5–0.6 mm, not winged.

1–1.35 mm, not winged.

with 30–60 indistinct ribs, staying within fruit wall after ripening.

with 15–29 distinct ribs.

white, small, often decaying.

white, small, often decaying.

floating, 1 or 2–few, coherent in groups, obovate, scarcely gibbous, flat, 1–4 mm, 1–1.5 times as long as wide, margins entire;

veins 3, greatest distance between lateral veins near or distal to above middle;

papillae distinct on midline of upper surface (apical papilla scarcely larger than others);

lower surface often red (more intensely so than on upper), coloring beginning at attachment point of root, upper surface (especially near apex) sometimes with red spots;

air spaces to 0.3 mm;

turions sometimes present, rootless, olive to brown, 0.8–1.6 mm diam., sinking to bottom.

floating or (rarely) submersed, 1 or 2–few, coherent in groups, ovate to lanceolate, flat, thin, 1–5 mm, 1.3–3 times as long as wide, margins entire;

veins 1, mostly prominent, longer than extension of air spaces, or running through at least 3/4 of distance between node and apex;

with or without small papillae along midline of upper surface;

anthocyanin absent;

largest air spaces much shorter than 0.3 mm;

turions absent.

= 40, 42 (G), 50, 80.

= 40, 42.