Flora of North America species comparison

7–21, to 3 cm, 1 or 2 perforating scale.

(1–)2–7(–12), to 7 cm, all perforating scale.

ovaries 1–2-ovulate.

ovaries 1–2-ovulate.

1–1.5 mm, laterally winged to apex.

0.8–1 mm, laterally winged to apex.

with 12–20 distinct ribs.

with 10–15 distinct ribs.

obovate to circular, flat or rarely gibbous, 2–10 mm, 1–1.5 times as long as wide, apex rounded or pointed, upper surface sometimes with red spot in center;

veins 7–16(–21);

turions sometimes present, rootless, brownish olive, circular-reniform, 1–2 mm diam.

obovate, flat or gibbous, 1.5–8 mm, 1.5–2 times as long as wide, apex mostly pointed, upper surface without red spot;

veins (3–)5–7; distinct turions absent.

= 30, 38, 40, 50, 80.

= 40, 46, 50