Flora of North America species comparison

usually simple, rarely branched.

solitary, simple.

1–5 pairs, mostly cauline; petiolate (petioles broadly to narrowly winged, shorter than blades);

blades broadly lanceolate to linear, 2–20 × 0.3–4 cm, margins entire or irregularly denticulate or dentate, apices acute or acuminate, faces glabrous or densely woolly-villous and stipitate-glandular.

3–5 pairs, crowded toward stem bases (some or all axils with dense tufts of brown wool); petiolate (petioles at least basal leaves, narrow or broadly winged);

blades (with 3 or 5 prominent, subparallel veins) usually narrowly oblanceolate to oblong, rarely oval or broadly spatulate, 4.5–20 × 0.5–2.5 cm, margins denticulate, apices obtuse, faces moderately uniformly hairy, stipitate-glandular.

hemispheric.

broadly hemispheric.

6–16;

corollas yellow.

8–16;

corollas yellow-orange.

corollas yellow;

anthers yellow.

corollas yellow;

anthers yellow.

9–22, usually narrowly to broadly lanceolate, sometimes oblanceolate.

13–21, elliptic-oblong or narrowly to broadly lanceolate.

1–3(–5; erect).

1(–3).

brown, 3–8 mm, densely hirsute, rarely glandular;

pappi white, bristles barbellate.

brown, 3.5–7 mm, densely hirsute, sometimes sparingly stipitate-glandular;

pappi usually white, sometimes tawny, bristles barbellate.

= 38, 57.