Flora of North America species comparison

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

4-8(-12) dm, 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: abaxial surface scattered-prickly on main veins, adaxial surface unarmed;

proximal lobed 2/3 distance to midrib;

distal clasping.

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

sepal horns terete, 5-10 mm, unarmed.

buds ellipsoid-oblong, body 15-22 × 10-15 mm, sparingly prickly;

sepal horns terete, 6-10(-15) mm, usually unarmed.

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, very rarely lavender;

stamens 150 or more;

filaments lemon yellow;

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 to broadly ellipsoid, 35-50 × 10-17 mm (including stigma and excluding prickles), prickly, surface clearly visible, prickles widely spaced, longest 4-10(-12) mm, interspersed with a few shorter ones.

1.6-2 mm.

ca. 2 mm.

= 28.

= 28.