Flora of North America species comparison

branching distally, 3-10 dm, sparingly prickly.

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

blades: abaxial surface sparingly prickly on veins, adaxial surface usually unarmed;

proximal deeply lobed nearly to midrib;

distal more shallowly lobed, usually 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 oblong, body 8-18 × 4-11 mm, with 4-10 prickles per sepal;

sepal horns terete, 5-12 mm, 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.

3-7 cm broad, closely subtended by 1-2 foliaceous bracts;

petals lemon yellow or rarely darker yellow;

stamens 20-75;

filaments yellow;

pistil 3-6-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.

ovoid-ellipsoid to oblong, 20-50 × 10-18 mm (including stigma and excluding prickles), longest prickles 8-12 mm.

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.

1.5-2 mm.

2-2.5 mm.

= 56.