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 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.

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

± hemispheric, 5–7 mm diam.

12–13;

laminae 15–25+ mm.

(9–)10–12+;

laminae 4–6 mm.

60–100+;

corollas yellow.

20–25+;

corollas ochroleucous or white.

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

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

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

30–80+ in ± paniculiform arrays.

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

pappi 0–0.5 mm.

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

pappi 1.5–2+ mm.

= 34.

= 34.