Flora of North America species comparison

often branching from base, 2.5-8 dm, unarmed or sparingly prickly.

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

blades: surfaces unarmed or sparingly prickly on veins;

proximal lobed 1/2 or more distance to midrib;

distal more shallowly lobed, mostly 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 subglobose, body 10-15 × 9-13 mm, unarmed or sparingly prickly;

sepal horns terete, 5-10 mm, unarmed.

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

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

4-7 cm broad, subtended by 1-2 foliaceous bracts;

petals bright yellow or rarely pale lemon yellow;

stamens 30-50;

filaments yellow;

pistil 4-6-carpellate.

7-10 cm broad;

petals white;

stamens 100 or more;

filaments pale yellow;

pistil 3-carpellate.

oblong to broadly ellipsoid, 25-45 × 12-20 mm (including stigma and excluding prickles when present), unarmed or prickly, longest prickles 6-10 mm.

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

1.6-2 mm.

ca. 2 mm.

= 28.