Flora of North America species comparison

erect, branched from bases or throughout.

cauline; mostly opposite (distal sometimes alternate);

petiolate or sessile;

blades (or lobes) ovate, oblanceolate, or linear, 1-pinnately lobed, ultimate margins ± toothed (teeth often bristle-tipped), faces glabrous or ± hirtellous to scabrellous (oil-glands usually borne at bases of lobes and subterminally near apices).

campanulate to obconic [hemispheric], [5–]7–20+ mm diam.

convex, ± pitted (socket margins fimbrillate to setose), epaleate.

usually 7–16[–16], rarely 0, pistillate, fertile;

corollas yellow to orange or red-orange.

25–70[100+], bisexual, fertile;

corollas yellow to yellow-orange, tubes shorter than cylindric throats, lobes 5, lance-ovate to lance-linear.

persistent, 8–20+ in ± 2 series (weakly connate 1/3–3/4 their lengths, separating in age, mostly lanceolate to linear, margins of outer distinct to bases or nearly so, oil-glands in faces and near margins).

of 3–5 or 12–22 linear to subulate bractlets (sometimes with 1–2 lobes, often bristle-tipped, usually bearing oil-glands).

usually radiate, rarely discoid, borne singly.

obpyramidal [obconic], glabrous or ± strigose or sericeous;

pappi persistent, of 8–20 scales in 1–2 series (single scales muticous, or unequally 3-aristate, or comprising 5–11 basally connate bristles).

= 7, 13.