Flora of North America species comparison

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

4-8(-12) dm, sparingly prickly.

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 moderately prickly on veins, adaxial surface unarmed to sparingly prickly on main veins;

basal and proximal lobed to 4/5 distance to midrib.

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

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

buds broadly ellipsoid-oblong, body 12-20 × 10-15 mm, somewhat prickly;

sepal horns often angular in cross section, 5-10 mm, slightly prickly basally.

7-10 cm broad;

petals white;

stamens 150 or more;

filaments pale yellow;

pistil 3-4-carpellate.

6-9 cm broad, usually closely subtended by 1-2 foliaceous bracts;

petals white or lavender;

stamens 150 or more;

filaments lemon yellow to red;

pistil 3-6-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 to broadly ellipsoid, 25-40(-50) × 8-15(-18) mm (including stigma and excluding prickles), prickly, surface clearly visible;

prickles unequal, longest 5-7(-10) mm.

ca. 2.5 mm.

ca. 1.5 mm.

= 28, 56.