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

0.5–0.6 mm, not winged.

0.6–1 mm, laterally winged.

with 30–60 indistinct 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–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, 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 (G), 50, 80.

= 40, 42, 44, 50.