Flora of North America species comparison

all or mostly opposite (distal sometimes alternate);

blades ovate-deltate or rhombic to lance-elliptic, 3–5 × 1–3 cm, bases subtruncate to cuneate, margins coarsely toothed to subentire, apices obtuse to acute, faces ± hirtellous to scabrellous.

all or mostly alternate (proximal sometimes opposite);

blades lance-ovate or lance-elliptic to lance-linear, 5–12(–22+) × 1–6(–12+) cm, sometimes pinnately lobed, bases ± cuneate, ultimate margins usually coarsely toothed to subentire, sometimes sinuate, apices acute, faces ± scabrellous to strigillose.

± hemispheric, 10–15+ mm diam.

± obconic to turbinate, 3–5 mm diam.

8–13;

laminae 15–25+ mm.

(1–)2–3(–7);

laminae 3–4(–7+) mm.

60–100+;

corollas yellow.

8–12(–15);

corollas ochroleucous or white.

18–30+ in 3–4 series, ± erect, oblong to elliptic, 6–10+ mm.

8–12+ in 1–2 series, ± erect, spatulate to oblanceolate, 2.5–5(–7) mm.

borne singly.

(20–)60–100+ in corymbiform to paniculiform arrays.

dark brown, ± elliptic, 10 mm, faces glabrous;

pappi 0–0.5 mm.

dark brown to blackish, oblanceolate, 3.5–5+ mm, faces ± scabrellous;

pappi 1.5–3+ mm.

= 34.

= 32, 34.