Flora of North America species comparison

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

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

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

sepal horns terete, 5-10 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.

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.

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

1.6-2 mm.

2-2.5 mm.

= 28.