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-elliptic or lanceolate to lance-linear, 10–25+ × 2–8+ cm, bases narrowly cuneate, margins coarsely toothed to subentire, apices attenuate, faces scabrellous.

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

± saucerlike, 10–12+ mm diam.

12–13;

laminae 15–25+ mm.

(2–)6–8+;

laminae 15–25+ mm.

60–100+;

corollas yellow.

40–60+;

corollas yellow.

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

8–12+ in 1(–2) series, ± spreading to reflexed, spatulate or lance-linear to linear, 3–8+ mm.

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

(3–)8–25(–50+) in corymbiform to paniculiform arrays.

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

pappi 0–0.5 mm.

dark brown to black, oblanceolate to ± orbiculate, 4.5–5 mm, faces sparsely hirtellous to glabrate;

pappi 1.5–2 mm.

= 34.

= 68.