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 ± rhombic to ovate, 5–12+ × 3–6+ cm, bases rounded to cuneate, margins coarsely toothed to subentire, apices ± acute, faces ± scabrellous.

± saucerlike, 8–10 mm diam.

± hemispheric, 10–20+ mm diam.

0.

10–13;

laminae 12–25+ mm.

40–60+;

corollas ochroleucous to white.

60–100+;

corollas yellow.

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

24–30+ in 2–3 series, ± erect, spatulate or oblanceolate to lanceolate, 5–12+ mm.

8–35+ in corymbiform to paniculiform arrays.

borne singly or (2–)5–15+ 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, narrowly lance-elliptic, 8–10 mm, faces glabrous or sparsely hirtellous;

pappi 3–4 mm.

= 34.