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 ± rhombic to ovate, 5–12+ × 3–6+ cm, bases rounded to cuneate, margins coarsely toothed to subentire, apices ± acute, faces ± scabrellous.

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

± hemispheric, 10–20+ mm diam.

12–13;

laminae 15–25+ mm.

10–13;

laminae 12–25+ 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.

24–30+ in 2–3 series, ± erect, spatulate or oblanceolate to lanceolate, 5–12+ mm.

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

borne singly or (2–)5–15+ in loose, corymbiform arrays.

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

pappi 0–0.5 mm.

dark brown, narrowly lance-elliptic, 8–10 mm, faces glabrous or sparsely hirtellous;

pappi 3–4 mm.

= 34.