Flora of North America species comparison

petioles 2–15 mm;

blades deltate-ovate to ovate-rhombic, 6–23 × 5–24 mm, margins usually entire or serrate to serrate-crenate, sometimes shallow-lobed.

cauline; opposite or alternate; petiolate or sessile;

blades mostly deltate to ovate or lanceolate overall, sometimes cordate, linear, reniform, rhombic, orbiculate, or ovate, often 3-lobed to pinnatisect, ultimate margins subentire to doubly serrate, faces glabrous or hairy, usually gland-dotted.

5–25 mm.

campanulate.

cylindric to campanulate or hemispheric.

flat or convex, epaleate.

6–10;

corollas white, sometimes pink tinged, laminae broadly oblong to oblong-elliptic, 3–7 × 1.5–3 mm.

0 or 8–12 pistillate, fertile;

corollas yellow or white.

30–40;

corollas yellow, often purple tinged, tubes 0.8–1 mm, throats tubular to tubular-funnelform, 1.2–1.4 mm, lobes 0.3–0.4 mm.

5–100+, bisexual, fertile;

corollas yellow or white, tubes shorter than or about equaling cylindric to funnelform or campanulate throats, lobes 4, deltate (equal);

anther thecae pale;

stigmatic papillae in 2 lines.

13–20, linear-lanceolate to narrow-ovate, 4–5.5 × 1–2 mm.

persistent, 8–21 in 1(–3) series (distinct or connate, ovate to obovate or linear, subequal, often conduplicate, herbaceous, margins scarious).

0.

in corymbiform arrays, 5–7 × 5.5–7 mm.

radiate or discoid, borne singly or in corymbiform arrays.

linear-oblong to oblanceolate, 2–2.8 mm, margins prominently calloused, long-ciliate;

pappi of 2(–3+) barbellulate bristles 1.5–2.5 mm plus crowns of hyaline, laciniate scales.

linear or cuneiform to oblong or oblanceolate, strongly flattened or weakly 3–4-angled (callous-margined, usually ciliate);

pappi 0, or persistent or falling, vestigial, or of 8–12 linear to subulate, laciniate or fimbriate scales, sometimes 1–2(–4) scales aristate, or of 1–2(–6) or 8–35 bristles.

= 34.