Flora of North America species comparison

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

widely branching, to ca. 8 dm, prickly throughout.

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 sparingly to copiously prickly on and sometimes between veins, adaxial surface less so;

proximal lobed 5/6 distance to midrib;

distal often clasping.

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 oblong, body 18-25 × 14-18 mm, prickly, longest prickles sometimes branched;

sepal horns angular in cross section or flattened, 8-12 mm, prickly, apical prickle indurate.

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.

8-12 cm broad, closely subtended by 1-2 foliaceous bracts;

petals white;

stamens 150 or more;

filaments pale yellow;

pistil 5-6-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.

ovoid, 40-50 × 15-25 mm (including stigma and excluding prickles);

prickles herbaceous, erect or reflexed, often branched, very unequal, longest 15-35 mm.

1.6-2 mm.

2.5-3 mm.

= 84.