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 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.

campanulate to turbinate, 3–5+ mm diam.

± obconic to turbinate, 3–5 mm diam.

(0–)1–3(–5);

laminae 10–15(–20+) mm.

(1–)2–3(–7);

laminae 3–4(–7+) mm.

8–15+;

corollas yellow.

8–12(–15);

corollas ochroleucous or white.

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

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

20–100+ in corymbiform-paniculiform arrays.

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

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

pappi 3–4 mm.

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

pappi 1.5–3+ mm.

= 34.

= 32, 34.