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 ± 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.

± saucerlike, 8–10 mm diam.

± hemispheric, 8–10 mm diam.

0.

(5–)11–13;

laminae (15–)25–30+ mm.

40–60+;

corollas ochroleucous to white.

40–60(–80+);

corollas yellow.

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

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

8–35+ in corymbiform to paniculiform arrays.

(3–)12–25+ in ± paniculiform arrays.

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

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

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

pappi 0.5–1 mm.

= 34.

= 34.