Flora of North America species comparison

to 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.

0.5–0.7 mm, not winged.

0.6–1 mm, laterally winged.

with 10–16 distinct 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 2–5 or more, coherent in groups, obovate, flat or gibbous, 1–3.5 mm, 1–1.5 times as long as wide, margins entire;

veins 3, greatest distance between lateral veins near middle;

very distinct papillae near apex, some smaller indistinct ones on midline of upper surface;

lower surface very often red colored (more intensely than on upper), coloring beginning at attachment point of root, lower upper surface sometimes with red spots;

air spaces 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.

= 40, 42, 44, 50.