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 deltate to lanceolate, 4–10(–25+) × 2–6(–15) cm, bases broadly cuneate to ± truncate, margins coarsely toothed to subentire, apices obtuse to acute, faces ± hirtellous.

campanulate to turbinate, 3–5+ mm diam.

± hemispheric, 5–7 mm diam.

(0–)1–3(–5);

laminae 10–15(–20+) mm.

(9–)10–12+;

laminae 4–6 mm.

8–15+;

corollas yellow.

20–25+;

corollas ochroleucous or white.

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

12–15+ in 2 series, ± erect, spatulate to linear, 2.5–4 mm.

20–100+ in corymbiform-paniculiform arrays.

30–80+ in ± paniculiform arrays.

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

pappi 3–4 mm.

dark brown to blackish, oblanceolate, 4–5 mm, faces ± hirtellous or glabrous;

pappi 1.5–2+ mm.

= 34.

= 34.