Flora of North America species comparison

4-10(-15) dm, sparingly to moderately prickly.

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

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

basal and proximal lobed 1/2-4/5 distance to midrib;

distal clasping.

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

buds broadly ellipsoid to subglobose, body 12-18 × 10-16 mm, sparingly to rather closely prickly;

sepal horns terete, 3-6(-10) mm, usually 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.

5-10 cm broad, closely to more distantly subtended by 1-2 foliaceous bracts;

petals white;

stamens 150 or more;

filaments lemon yellow;

pistil (3-)4-5(-7)-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, oblong-ellipsoid, or narrowly ellipsoid, 20-40(-45) × 10-15(-25) mm (including stigma and excluding prickles), prickly, surface clearly visible to partially obscured, longest prickles widely spaced, 6-10(-12) mm, sometimes interspersed with smaller ones.

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.