OregonFlora species comparison

erect, ascending, decumbent, or floating; simple or branched, glabrous to lightly puberulent or minutely pustulose.

cauline; opposite; simple or pinnately compound, sometimes finely divided, glabrous, sessile or petiolate.

usually corymb-like arrays or heads solitary and terminal.

hemispheric or campanulate to cylindric.

flat or convex, paleate.

present or 0; neuter or pistillate and sterile;

corollas yellow to orange.

bisexual;

corollas tubular, linear below, gradually or abruptly widened distally, exserted from involucres, 5-lobed;

lobes triangular, partly exserted from corollas;

style branches exserted from stamen tubes.

in ~2 series; outer bracteate, herbaceous, sometimes a few bracts enlarged and foliaceous; inner erect; firm, elliptic-lanceolate; ± equal;

margins membranous;

veins many; parallel.

obcompressed; flat, or 3–4-angled, cuneate to oblanceolate, obovate, or fusiform, glabrous or pubescent;

pappi 0 or of 2–6 stout, persistent, retrorsely barbed or ciliate awns.

radiate, discoid, or ± disciform.