Flora of North America species comparison

blades usually shallowly, sometimes deeply 5–7-lobed, 8–20(–35) cm wide.

blades deeply 5(–7)-lobed, 5–30 cm wide.

sepals (pistillate) deltate to subulate or filiform, 1 mm;

petals 8–10 mm (pistillate) or 5–6 mm (staminate), corolla usually white to cream, rarely greenish, cupulate to cupulate-rotate;

staminodia present in pistillate flowers.

sepals (pistillate) deltate, 0.4–0.6 mm, sometimes vestigial;

petals (1–)3–10(–12) mm (pistillate) or 5–8(–10) mm (staminate), corolla white, shallowly cupulate to rotate;

staminodia scalelike or absent in pistillate flowers.

usually striped dark green at maturity, short-ellipsoid to ovoid, tapered to beak, 4–6.5(–8) cm, surface sparsely to moderately echinate (usually smooth distally), spinules weak, flexible, 3–6 mm.

yellowish green at maturity, short-ellipsoid to broadly ovoid, usually rounded at both ends, sometimes sharply beaked, (5–)8–12 cm, surface densely echinate, spinules rigid, 5–30 mm.

3–6, orbiculate to elliptic, compressed, 16–22 mm.

4–20(–24), usually obovate to oblong-elliptic, sometimes subglobose, not flat at one end, slightly compressed, 15–20 mm.

= 32.

= 32, 64.