Flora of North America species comparison

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

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

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.

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.

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.

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.

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

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

= 32, 64.

= 32.