Flora of North America species comparison

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

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

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

basal and proximal lobed to 4/5 distance to midrib.

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

buds broadly ellipsoid-oblong, body 12-20 × 10-15 mm, somewhat prickly;

sepal horns often angular in cross section, 5-10 mm, slightly prickly basally.

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.

6-9 cm broad, usually closely subtended by 1-2 foliaceous bracts;

petals white or lavender;

stamens 150 or more;

filaments lemon yellow to red;

pistil 3-6-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.

narrowly to broadly ellipsoid, 25-40(-50) × 8-15(-18) mm (including stigma and excluding prickles), prickly, surface clearly visible;

prickles unequal, longest 5-7(-10) mm.

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.

ca. 1.5 mm.

1.8-2.2 mm.

= 28, 56.