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 lance-elliptic to lanceolate or lance-linear, 10–20 × 2–7 cm, bases ± cuneate, margins coarsely toothed to subentire, apices acute, faces ± hirtellous.

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

± saucerlike, 8–10 mm diam.

12–13;

laminae 15–25+ mm.

0.

60–100+;

corollas yellow.

40–60+;

corollas ochroleucous to white.

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

12–15+ in 1–2 series, ± spreading, oblanceolate to linear, 2–5+ mm.

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

8–35+ in corymbiform to paniculiform arrays.

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

pappi 0–0.5 mm.

dark brown to blackish, obovate, 3–4.5+ mm, faces ± strigillose;

pappi 1–2 mm (sometimes shorter scales between awns).

= 34.

= 34.