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) × 0.8–2.2(–3) cm, bases ± cuneate, margins toothed to subentire, apices ± rounded or obtuse, faces ± scabrellous.

± saucerlike, 8–10 mm diam.

± hemispheric to turbinate, 8–16 mm diam.

0.

0.

40–60+;

corollas ochroleucous to white.

40–60(–80+);

corollas yellow.

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

18–24+ in 2–3 series, ± erect, spatulate to lance-linear, 5–9+ mm.

8–35+ in corymbiform to paniculiform arrays.

borne singly or (2–)3+ in dichasial arrays.

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

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

purplish black, ± elliptic, 5–7 mm, faces glabrous or sparsely hirtellous;

pappi 0–0.3 mm.

= 34.

= 34.