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 sometimes opposite);

blades ± lance-ovate to lanceolate, 5–12+ × 2–5+ cm, bases ± cuneate, margins ± toothed, apices acute to attenuate, faces strigose to sericeous.

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

± hemispheric, 10–15+ mm diam.

12–13;

laminae 15–25+ mm.

8–13+;

laminae 20–25(–30+) mm.

60–100+;

corollas yellow.

40–80+;

corollas yellow.

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

16–21+ in 2–3 series, ± erect, lanceolate, 6–9+ mm.

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

2–5(–10+) in ± corymbiform arrays.

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

pappi 0–0.5 mm.

dark brown to black, oblanceolate to elliptic, 5 mm, faces strigillose to glabrate;

pappi 0.5–1.5 mm.

= 34.

= 34.