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-deltate to lance-elliptic, 3–8(–11) × 1–4(–6) cm, bases subtruncate to cuneate, margins coarsely toothed to subentire, apices acute to attenuate, faces ± hirsutulous to scabrellous.

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

± hemispheric, 8–10 mm diam.

12–13;

laminae 15–25+ mm.

13;

laminae 9–12+ mm.

60–100+;

corollas yellow.

60–100+;

corollas yellow.

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

12–16 in 2 series, ± erect, linear to lance-ovate or lance-linear, 4–7 mm.

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

borne singly or 2–6 in loose, corymbiform arrays.

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

pappi 0–0.5 mm.

dark brown, obovate, 4–5 mm, faces glabrous;

pappi 0–0.5 mm.

= 34.