Flora of North America species comparison

all or mostly alternate (proximal usually opposite);

blades lance-elliptic to lanceolate or lance-linear, 10–20 × 2–7 cm, bases ± cuneate, margins coarsely toothed to subentire, apices acute, faces ± hirtellous.

all or mostly opposite (distal sometimes alternate);

blades ± ovate or lance-deltate to lanceolate, 6–12(–16+) × 3–6(–10+) cm, bases ± cuneate, margins coarsely toothed to subentire, apices usually acute to attenuate, sometimes rounded, faces scabrellous.

± saucerlike, 8–10 mm diam.

campanulate to turbinate, 3–5+ mm diam.

0.

(0–)1–3(–5);

laminae 10–15(–20+) mm.

40–60+;

corollas ochroleucous to white.

8–15+;

corollas yellow.

12–15+ in 1–2 series, ± spreading, oblanceolate to linear, 2–5+ mm.

8–12+ in 2 series, ± erect, spatulate to oblanceolate, 3–7+ mm.

8–35+ in corymbiform to paniculiform arrays.

20–100+ in corymbiform-paniculiform arrays.

dark brown to blackish, obovate, 3–4.5+ mm, faces ± strigillose;

pappi 1–2 mm (sometimes shorter scales between awns).

dark brown to black, oblanceolate, 5 mm, faces strigose;

pappi 3–4 mm.

= 34.

= 34.