Flora of North America species comparison

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

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

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.

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

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

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.

7-10 cm broad;

petals white;

stamens 150 or more;

filaments pale yellow;

pistil 3-4-carpellate.

6-9 cm broad;

petals white;

stamens about 150;

filaments pale yellow;

pistil 3-4-carpellate.

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

ca. 2.5 mm.

to 2 mm.

= 28.