Flora of North America species comparison

erect, branched.

cauline; opposite (proximal) or alternate (mostly);

sessile;

blades mostly linear, sometimes pinnately lobed, ultimate margins entire, faces glabrous (often granular-glandular).

ovoid to campanulate, 3–4+ mm diam.

conic, pitted or smooth, glabrous, epaleate.

0 (or inconspicuous; peripheral 3–8 florets pistillate, fertile; corollas yellow, tubular or nearly so).

2–25+, bisexual, fertile;

corollas yellow, tubes about equaling campanulate throats, lobes 5, ± deltate.

persistent, 3–6+ in 1–2 series (± erect in fruit, distinct, obovate, herbaceous to membranous or scarious, flat or weakly cupped at bases, glabrous or granular-glandular).

discoid or disciform, in corymbiform or paniculiform arrays.

mostly obpyramidal, (3–)4-angled, hairy;

pappi persistent, of 7–10+ oblong to spatulate scales.

= 8.