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 to elliptic or lanceolate, 3–7+ × 0.8–2.5+ cm, bases ± cuneate, margins toothed, apices obtuse, faces scabrellous.

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

hemispheric or broader, 12–15+ mm diam.

12–13;

laminae 15–25+ mm.

(5–)8;

laminae 12–15+ mm.

60–100+;

corollas yellow.

20–60+;

corollas yellow.

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

18–20+ in 2–3 series, ± erect, narrowly oblong to lanceolate, 4–6+ mm.

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

borne singly or 3–9+ in loose, corymbiform arrays.

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

pappi 0–0.5 mm.

purplish black, narrowly obovate to ± elliptic, 5 mm, faces glabrous;

pappi 0–0.3 mm.

= 34.

= 34.