Flora of North America species comparison

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

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

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

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

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

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

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.

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.

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 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.

1.6-2 mm.

ca. 1.5 mm.

= 28, 56.