OregonFlora species comparison

ascending to erect.

usually much branched, glabrous or minutely puberulent.

1.5–10 cm;

basal withering by flowering;

cauline gradually reduced.

basal and cauline, alternate, 1–3-pinnate, ultimate segments filiform to linear;

margins crenate or serrate;

surfaces glabrous;

proximal petiolate;

distal sessile.

corymb-like arrays or heads solitary;

peduncles glabrous.

3–4.5 mm.

campanulate to hemispheric.

rounded to hemispheric; well exceeding involucres;

paleae 0.

10–25;

rays reflexed and persisting in fruit, 7–15+ mm, white.

pistillate;

rays lanceolate to ovate, often 2–3-toothed;

tips acute or obtuse.

numerous;

corollas 1–2.5 mm, yellow.

bisexual;

corollas tubular, widened near tips, 5-lobed;

lobes triangular, spreading;

stamens exserted;

stigmas exserted.

in 3–5 subequal series, broadly lanceolate to ovate;

margins membranous; midribs dark green or brownish;

tips acute.

1.5–2 mm; pale to dark brown; resin glands ± circular.

obovoid or obconic, prominently 3–5-ribbed; inter-rib areas minutely roughened, often with 1–5 circular to elongate; apical resin glands;

pappi 0 or of low crowns.

10–200;

peduncles 3–15 cm.

radiate.

=18, 36.