Flora of North America species comparison

branching distally, 3-10 dm, sparingly prickly.

5-8 dm, diffusely branched, often decumbent, copiously long-prickly.

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

proximal deeply lobed nearly to midrib;

distal more shallowly lobed, usually clasping.

blades: surfaces sparingly long-prickly on veins;

basal and proximal lobed nearly to midrib, lobe length often to 5 times width;

distal not clasping.

buds oblong, body 8-18 × 4-11 mm, with 4-10 prickles per sepal;

sepal horns terete, 5-12 mm, unarmed.

buds ellipsoid-oblong, body 15-18 × 12-15 mm, prickly;

sepal horns slender, terete, 12-15 mm, prickly at base.

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.

7-10 cm broad;

petals white;

stamens 100 or more;

filaments pale yellow;

pistil 3-carpellate.

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

narrowly ellipsoid-oblong, 35-45 × 10-14 mm (including stigma and excluding prickles), closely prickly, longest prickles 8-10 mm.

1.5-2 mm.

ca. 2 mm.

= 56.