Flora of North America species comparison

petioles 1–6 mm;

blades usually elliptic, lanceolate, lance-ovate, ovate, or suborbiculate, sometimes linear, 4–8(–15) × 1–10(–12) mm, margins entire, irregularly and sparsely serrate, or serrate-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.

10–45(–80) mm.

campanulate.

cylindric to campanulate or hemispheric.

flat or convex, epaleate.

0.

0 or 8–12 pistillate, fertile;

corollas yellow or white.

45–60;

corollas yellow, tubes 1–1.6 mm, throats tubular to subfunnelform, 1.6–2.2 mm, lobes 0.4–0.7 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.

14–20, lanceolate to suboblanceolate, 5–6 × 1.3–1.9 mm.

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

0.

borne singly or (2–3) in loose, corymbiform arrays, 6–9(–10) × 5–6(–8) mm.

radiate or discoid, borne singly or in corymbiform arrays.

narrowly oblanceolate to suboblanceolate, 2.5–3 mm, margins thin-calloused, short-hairy;

pappi 0, or of single bristles.

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.