Flora of North America species comparison

usually 1, usually erect.

basal and cauline; alternate;

petiolate or sessile;

blades pinnately nerved, mostly ovate to lanceolate (sometimes pinnately lobed or dissected), ultimate margins entire, denticulate, or toothed, faces glabrous or ± tomentose or villous (often unevenly glabrescent).

urceolate or cylindric to turbinate, 2–10+ mm diam.

flat to convex, ± foveolate or smooth, epaleate.

0.

10–100+ (in 1–3+ series), corollas whitish to pale yellow, tubular-filiform, lobes 4–5, deltate, erect.

(3–)10–20(–50+), mostly bisexual and fertile, inner sometimes functionally staminate;

corollas whitish to pale yellow [pinkish], tubes longer than funnelform throats, lobes 4–5, erect to spreading, lance-ovate;

style branches stigmatic in 2 lines, apices truncate-penicillate.

persistent, usually (5), 8, 13, or 21 in 1–2 series, erect (sometimes reflexed in fruit), distinct (margins ± interlocking), lanceolate to linear, equal, margins ± scarious (tips green or with minute dark spots).

of 1–6[–12+] bractlets.

disciform, in cymiform or corymbiform arrays.

(stramineous to brown or purple) ± prismatic and 5-angled or -ribbed or ± obovoid to ± fusiform and 10–20-nerved, glabrous or puberulent (on or between ribs or nerves);

pappi readily falling, of 60–120, white [reddish], barbellulate bristles.

= 20.