Flora of North America species comparison

4-10(-15) dm, sparingly to moderately prickly.

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

blades: abaxial surface sparingly prickly on main veins, adaxial surface unarmed or sparingly prickly on main veins;

basal and proximal lobed 1/2-4/5 distance to midrib;

distal 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 broadly ellipsoid to subglobose, body 12-18 × 10-16 mm, sparingly to rather closely prickly;

sepal horns terete, 3-6(-10) mm, usually 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.

5-10 cm broad, closely to more distantly subtended by 1-2 foliaceous bracts;

petals white;

stamens 150 or more;

filaments lemon yellow;

pistil (3-)4-5(-7)-carpellate.

8-12(-16) cm broad;

petals white;

stamens ca. 150;

filaments pale yellow to red;

pistil 3-4-carpellate.

oblong, oblong-ellipsoid, or narrowly ellipsoid, 20-40(-45) × 10-15(-25) mm (including stigma and excluding prickles), prickly, surface clearly visible to partially obscured, longest prickles widely spaced, 6-10(-12) mm, sometimes interspersed with smaller ones.

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.