Flora of North America species comparison

shorter than 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-ovulate, utricular scale with narrow opening at apex.

0.5–0.6 mm, not winged.

0.8–1 mm, laterally winged toward apex.

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

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

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, 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.

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

= 40, 42 (B), 50, 63, 126.