Flora of North America species comparison

all or mostly opposite (distal sometimes alternate);

blades ± ovate or lance-deltate to lanceolate, 6–12(–16+) × 3–6(–10+) cm, bases ± cuneate, margins coarsely toothed to subentire, apices usually acute to attenuate, sometimes rounded, faces scabrellous.

all or mostly alternate (proximal usually opposite);

blades deltate-ovate or rhombic to lanceolate, 3–8(–12+) × 2–4(–6+) cm, bases broadly cuneate to ± truncate, margins coarsely toothed to subentire, apices acute to attenuate, faces strigoso-scabrellous to sericeous.

campanulate to turbinate, 3–5+ mm diam.

± hemispheric to saucerlike, 10–20+ mm diam.

(0–)1–3(–5);

laminae 10–15(–20+) mm.

(8–)12–15+;

laminae 8–10(–20+) mm.

8–15+;

corollas yellow.

80–150+;

corollas yellow.

8–12+ in 2 series, ± erect, spatulate to oblanceolate, 3–7+ mm.

12–18+ in 1–2 series, ± erect to spreading, lance-ovate or lance-linear to linear, 6–8+ mm.

20–100+ in corymbiform-paniculiform arrays.

usually borne singly, sometimes 2–3+ in loose, cymiform or corymbiform arrays.

dark brown to black, oblanceolate, 5 mm, faces strigose;

pappi 3–4 mm.

dark brown to blackish, narrowly obovate, 3.5–5+ mm, faces ± strigillose;

pappi 0.5–1(–2) mm (0 on ray cypselae).

= 34.

= 34.