Flora of North America species comparison

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

3-6 dm, densely prickly and crisped-hispid.

blades: surfaces unarmed or sparingly prickly on veins;

proximal lobed 1/2 or more distance to midrib;

distal more shallowly lobed, mostly clasping.

blades: surfaces sparsely to densely crisped-hispid between veins, abaxial surface mostly densely prickly on midrib and main veins, adaxial surface less so;

proximal lobed 4/5 distance to midrib;

distal not clasping.

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

sepal horns terete, 5-10 mm, unarmed.

buds oblong, body 16-20 × 14-18 mm, prickly and hispid;

sepal horns 4-7 mm, prickly, apical prickle flattened, indurate.

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.

7-10 cm broad;

petals white;

stamens 150 or more;

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.

ovoid, 30-40 × 12-18 mm (including stigma and excluding prickles), densely prickly, surface obscured, longest prickles straight or incurved, ca. 5 mm.

1.6-2 mm.

ca. 2.5 mm.

= 28.