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 or ovate to lance-ovate, 2–6 × 1–5 cm, bases rounded to cuneate, margins toothed to entire, apices obtuse to acute, faces ± scabrellous.

± saucerlike, 8–10 mm diam.

± hemispheric, 15–22+ mm diam.

0.

± 13;

laminae 25 mm.

40–60+;

corollas ochroleucous to white.

80–120+;

corollas yellow.

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

24–30+ in 3–4 series, ± erect, oblong, orbiculate, or ovate, 5–12+ mm.

8–35+ in corymbiform to paniculiform arrays.

borne singly.

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

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

dark brown, narrowly elliptic, 7 mm, faces glabrous;

pappi 0–0.5 mm.

= 34.

= 34.