Flora of North America species comparison

usually 1, erect or ascending, branched distally or ± throughout.

mostly cauline; opposite;

petiolate or sessile;

blades usually 1–3-pinnately lobed [undivided], ultimate margins usually entire, faces usually glabrous, sometimes glabrate, hispid, puberulent, or scabridulous.

hemispheric or subhemispheric [cylindric], 3–15 mm diam.

flat, paleate;

paleae falling, linear, flat or slightly concave-convex, scarious (entire).

[0, 5] 8 (more in “double” cultivars), neuter;

corollas white to pink or purple, or yellow to red-orange.

10–20[–80+], bisexual, fertile;

corollas yellow [orange] (at least distally), tubes shorter than funnelform throats, lobes 5, ± deltate (staminal filaments hairy near anthers; style branches linear, flattened, thicker distally, hirtellous, appendages relatively slender).

persistent, [5–]8 in ± 2 series, distinct, lanceolate, lance-oblong, lance-ovate, or oblong, ± equal, membranous or herbaceous, margins ± scarious.

of [5–]8 basally connate, ± linear to subulate, herbaceous (striate) bractlets.

radiate, borne singly or in corymbiform arrays.

(dark brown or black) relatively slender, quadrangular-cylindric or -fusiform [outer somewhat obcompressed], sometimes slightly arcuate, attenuate-beaked, not winged [winged], faces glabrous or hispid to scabridulous or ± setose, sometimes papillate, usually with 1 groove;

pappi persistent [falling], of 2–4[–8] retrorsely [antrorsely] barbed awns, sometimes 0.

= 12.