Flora of North America species comparison

often branching from base, 2.5-8 dm, unarmed or sparingly prickly.

branched, 5-12 dm, sparingly to closely prickly.

blades: surfaces unarmed or sparingly prickly on veins;

proximal lobed 1/2 or more distance to midrib;

distal more shallowly lobed, mostly clasping.

blades: abaxial surface sparingly prickly on veins, adaxial surface unarmed or sparingly prickly on veins, apices of lobes angular, marginal teeth prominent;

proximal lobed ca. 3/4 distance to midrib;

distal sometimes clasping.

buds subglobose, body 10-15 × 9-13 mm, unarmed or sparingly prickly;

sepal horns terete, 5-10 mm, unarmed.

buds oblong-obovoid or subglobose, body 14-20 × 11-18 mm, prickly, prickles simple or branched;

sepal horns terete or adaxially flattened, 4-12 mm.

4-7 cm broad, subtended by 1-2 foliaceous bracts;

petals bright yellow or rarely pale lemon yellow;

stamens 30-50;

filaments yellow;

pistil 4-6-carpellate.

8-12(-16) cm broad;

petals white;

stamens ca. 150;

filaments pale yellow to red;

pistil 3-4-carpellate.

oblong to broadly ellipsoid, 25-45 × 12-20 mm (including stigma and excluding prickles when present), unarmed or prickly, longest prickles 6-10 mm.

ovoid to ellipsoid-lanceoloid, 25-45 × 10-16 mm (including stigma and excluding prickles), closely to sparingly prickly, longest prickles 4-6(-8) mm.

1.6-2 mm.

2-2.5 mm.

= 28.