Flora of North America species comparison

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

4-16 dm, densely to sparingly 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 copiously prickly on veins and intervein surfaces to sparingly prickly on main veins only;

basal lobed ca. 1/2 distance to midrib, lobe apices usually distinctly rounded, marginal teeth usually less than 1 mm;

distal usually definitely clasping.

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

sepal horns terete, 5-10 mm, unarmed.

buds oblong to ellipsoid to obovoid, body 12-22 × 10-16 mm, prickly;

sepal horns terete, flattened or angular in cross section, (4-)6-8(-10) mm, unarmed to densely 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.

5-10(-13) cm broad, not closely subtended by foliaceous bracts;

petals white;

stamens 150-250;

filaments pale yellow;

pistil 3-5-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.

ovoid, ellipsoid, or lanceoloid, 35-55 × 9-15(-18) mm (including stigma and excluding prickles), prickly, longest prickles to 10 mm, widely spaced, or shorter, more numerous, and interspersed with still shorter prickles, surface then partially obscured.

1.6-2 mm.

1.8-2.6 mm.

= 28.