Flora of North America species comparison

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

4-8 dm, sparingly to copiously prickly, prickles long, patent.

blades: surfaces unarmed or sparingly prickly on veins;

proximal lobed 1/2 or more distance to midrib;

distal more shallowly lobed, mostly clasping.

blades: abaxial surface prickly on main veins, adaxial surface less prickly to almost unarmed on veins.

buds subglobose, body 10-15 × 9-13 mm, unarmed or sparingly prickly;

sepal horns terete, 5-10 mm, unarmed.

buds broadly ellipsoid, body 15-20 × 11-15 mm, prickly, prickles patent;

sepal horns terete or angular in cross section, 7-12 mm, basally prickly.

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, usually closely subtended by 1-2 foliaceous bracts;

petals white or pale lavender;

stamens 150 or more;

filaments pale lemon yellow or red;

pistil 3-4-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-lanceoloid to ellipsoid-ovoid, 30-45 × 8-13 mm (including stigma and excluding prickles), prickly, surface clearly visible;

longest prickles scattered, to 10 mm, interspersed with a few shorter ones.

1.6-2 mm.

1.8-2.2 mm.

= 28.