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-deltate to lance-elliptic, 3–8(–11) × 1–4(–6) cm, bases subtruncate to cuneate, margins coarsely toothed to subentire, apices acute to attenuate, faces ± hirsutulous to scabrellous.

± saucerlike, 8–10 mm diam.

± hemispheric, 8–10 mm diam.

0.

13;

laminae 9–12+ mm.

40–60+;

corollas ochroleucous to white.

60–100+;

corollas yellow.

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

12–16 in 2 series, ± erect, linear to lance-ovate or lance-linear, 4–7 mm.

8–35+ in corymbiform to paniculiform arrays.

borne singly or 2–6 in loose, corymbiform arrays.

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

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

dark brown, obovate, 4–5 mm, faces glabrous;

pappi 0–0.5 mm.

= 34.