Flora of North America species comparison

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

widely branching, 4-8 dm, moderately to copiously prickly throughout.

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 prickly on main veins, adaxial surface prickly or unarmed on main veins, densely prickly-hispid to glabrous between veins;

basal lobed 2/3-4/5 distance to midrib, lobe apices angular, marginal teeth 3 mm or more;

distal 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 subglobose to oblong, body 16-25 × 15-20 mm, prickly;

sepal horns angular in cross section, 8-14(-18) mm, apical prickle indurate.

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.

8-11 cm broad, closely subtended by 1-2 foliaceous bracts;

petals white;

stamens 150 or more;

filaments pale yellow;

pistil 4-5-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.

ellipsoid, oblong or lance-ovoid, 25-50 × 10-18 mm (including stigma and excluding prickles);

prickles basally herbaceous, spreading or reflexed, unequal, longest branched, 8-15 mm.

1.6-2 mm.

2-2.5 mm.