Flora of North America species comparison

all or mostly opposite (distal sometimes alternate);

blades ovate-deltate or rhombic to lance-elliptic, 3–5 × 1–3 cm, bases subtruncate to cuneate, margins coarsely toothed to subentire, apices obtuse to acute, faces ± hirtellous to 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, 10–15+ mm diam.

± saucerlike, 8–10 mm diam.

8–13;

laminae 15–25+ mm.

0.

60–100+;

corollas yellow.

40–60+;

corollas ochroleucous to white.

18–30+ in 3–4 series, ± erect, oblong to elliptic, 6–10+ mm.

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

borne singly.

8–35+ in corymbiform to paniculiform arrays.

dark brown, ± elliptic, 10 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.