Flora of North America species comparison

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

4-12(-18) dm, moderately prickly throughout, prickles patent, longest 7-10 mm.

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 prickly on main veins, adaxial surface unarmed or sparingly prickly on midrib;

basal blades shallowly to often deeply lobed;

distal not clasping.

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

sepal horns terete, 5-10 mm, unarmed.

buds subglobose to oblong, body 15-18 × 12-15 mm, sparingly prickly, prickles patent;

sepal horns usually slender, terete, (5-)8-12(-14) mm, unarmed or with 1-2 prickles near base.

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.

6-9 cm broad;

petals white;

stamens about 150;

filaments pale yellow;

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.

narrowly ellipsoid to narrowly ellipsoid-ovoid, 30-45 × 8-14 mm (including stigma and excluding prickles), scattered-prickly, surface clearly visible, longest prickles 6-8(-10) mm.

1.6-2 mm.

to 2 mm.

= 28.

= 28.