Flora of North America species comparison

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.

all or mostly opposite (distal sometimes alternate);

blades ± ovate or lance-deltate to lanceolate, 6–12(–16+) × 3–6(–10+) cm, bases ± cuneate, margins coarsely toothed to subentire, apices usually acute to attenuate, sometimes rounded, faces scabrellous.

± hemispheric, 8–10 mm diam.

campanulate to turbinate, 3–5+ mm diam.

(5–)11–13;

laminae (15–)25–30+ mm.

(0–)1–3(–5);

laminae 10–15(–20+) mm.

40–60(–80+);

corollas yellow.

8–15+;

corollas yellow.

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

8–12+ in 2 series, ± erect, spatulate to oblanceolate, 3–7+ mm.

(3–)12–25+ in ± paniculiform arrays.

20–100+ in corymbiform-paniculiform arrays.

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

pappi 0.5–1 mm.

dark brown to black, oblanceolate, 5 mm, faces strigose;

pappi 3–4 mm.

= 34.

= 34.