OregonFlora species comparison

1–few from bases, decumbent to ascending or erect, branched principally in inflorescences.

alternate; simple;

margins entire or dentate;

surfaces glabrous to pubescent, sometimes resinous, sessile or petiolate.

pyramidal; flat-topped; corymb-, panicle-, or thyrse-like arrays.

cylindric or campanulate.

plane or convex;

paleae 0.

0 or 2–20+, pistillate;

rays narrow, yellow, rarely white.

bisexual;

corollas cylindric, widened distally, exceeding involucres, yellow;

lobes 5, triangular or lance-linear;

styles exserted.

usually in 3–5 unequal series; midribs swollen and translucent, sometimes with 2–5 additional nerves;

surfaces glabrous or puberulent, sometimes minutely glandular or resinous.

obconic or cylindric, slightly compressed, glabrous or strigose, 8–10-ribbed, pappi of persistent bristles, rarely with minute outer scales.

usually radiate, sometimes discoid; small.