Flora of North America species comparison

branching distally, 3-10 dm, sparingly prickly.

4-8(-12) dm, sparingly prickly.

blades: abaxial surface sparingly prickly on veins, adaxial surface usually unarmed;

proximal deeply lobed nearly to midrib;

distal more shallowly lobed, usually clasping.

blades: abaxial surface scattered-prickly on main veins, adaxial surface unarmed;

proximal lobed 2/3 distance to midrib;

distal clasping.

buds oblong, body 8-18 × 4-11 mm, with 4-10 prickles per sepal;

sepal horns terete, 5-12 mm, unarmed.

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

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

3-7 cm broad, closely subtended by 1-2 foliaceous bracts;

petals lemon yellow or rarely darker yellow;

stamens 20-75;

filaments yellow;

pistil 3-6-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.

ovoid-ellipsoid to oblong, 20-50 × 10-18 mm (including stigma and excluding prickles), longest prickles 8-12 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.

1.5-2 mm.

ca. 2 mm.

= 56.

= 28.