Flora of North America species comparison

terete to slightly square, sparsely scabrous or glabrous (sometimes glaucous).

terete, shaggy-hispid.

basal caducous;

cauline opposite, sessile;

blades lanceolate to ovate, 2–23 × 0.1–11 cm, bases round to caudate, margins finely serrate or entire, apices acute to acuminate, faces hispid, scabrous, or glabrous.

basal persistent, petiolate;

cauline usually alternate, sometimes opposite, petiolate or sessile;

blades lanceolate to narrowly ovate, 1.5–26 × 0.5–14 cm, bases attenuate to acute, margins coarsely toothed or entire, apices acuminate, faces shaggy-hispid.

12–36;

corollas yellow.

10–20;

corollas pale yellow.

70–225;

corollas yellow.

40–85;

corollas pale yellow.

17–37 in 2–3 series, outer appressed, apices acute to acuminate, abaxial faces glabrous, hispid, pilose, or scabrous, sometimes stipitate-glandular.

14–19 in 2–3 series, outer appressed, apices acuminate to acute, abaxial faces shaggy-hispid.

9–14 × 6–10 mm;

pappi 1–4 mm.

6–10 × 4–7 mm;

pappi 1–2 mm.