Flora of North America species comparison

all or mostly opposite (distal sometimes alternate);

blades ± lance-linear (lengths 10–15 times widths), 9–12(–20+) × 0.6–1.2(–1.5+) cm, bases rounded, margins obscurely toothed to subentire, apices ± attenuate, faces ± scabrellous.

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.

± hemispheric to saucerlike, 11–15+ mm diam.

campanulate to turbinate, 3–5+ mm diam.

12–13;

laminae 15–25+ mm.

(0–)1–3(–5);

laminae 10–15(–20+) mm.

60–100+;

corollas yellow.

8–15+;

corollas yellow.

18–24+ in 2–3 series, ± erect to spreading, linear to lance-linear, 5–15+ mm.

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

borne singly or 3–5+ in loose, corymbiform arrays.

20–100+ in corymbiform-paniculiform arrays.

dark brown, oblanceolate to elliptic, 7 mm, faces glabrous;

pappi 0–0.5 mm.

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

pappi 3–4 mm.

= 34.

= 34.