Flora of North America species comparison

usually 1, erect (usually branched ± throughout).

(sometimes ± fleshy) basal and cauline; alternate; mostly sessile;

blades pinnately nerved, linear (or pinnately divided into 2–15 linear lobes), ultimate margins entire, faces glabrous or sparsely floccose-tomentose.

± hemispheric, 3–6+ mm diam.

flat to convex, smooth or foveolate, epaleate.

5–13+, pistillate (sometimes, some pistillate florets lack corollas);

corollas sessile (lacking tubes), usually yellow, rarely white (often purplish abaxially, laminae ovate to linear).

20–60(–100+), functionally staminate;

corollas yellow, tubes shorter to longer than campanulate throats;

lobes 5, ± erect, deltate to lanceolate;

styles not divided.

persistent, 5–13+ in ± 2 series, ± erect (inflexed in late flowering, reflexed in fruit), basally connate, elliptic to ovate, subequal, ± membranous (veiny, tips usually purple).

radiate, borne singly.

± ellipsoid, usually 5–6(–10)-ribbed or -angled, usually papillate (papillae becoming mucilaginous when wetted);

pappi 0.

= 9.