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 ± elliptic, 3–6(–10) × 1.2–2.8(–3.5) cm, bases rounded, margins toothed, apices ± rounded to acute, faces hirsutulous to hispido-scabrellous or scabrellous.

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

± hemispheric, 8–10 mm diam.

12–13;

laminae 15–25+ mm.

(5–)11–13;

laminae (15–)25–30+ mm.

60–100+;

corollas yellow.

40–60(–80+);

corollas yellow.

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

16–24+ in 2–3 series, ± erect, linear, 2–3+ mm.

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

(3–)12–25+ in ± paniculiform arrays.

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

pappi 0–0.5 mm.

purplish black, ± obovate, 4–5 mm, faces glabrous;

pappi 0.5–1 mm.

= 34.

= 34.