Flora of North America species comparison

square, glabrous, hispid, or scabrous.

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

basal caducous;

cauline usually opposite, rarely whorled (in 3s), petiolate or sessile;

blades deltate, lanceolate, or ovate, 2–41 × 0.5–24 cm, bases attenuate or truncate (distal connate-perfoliate), margins entire, dentate, or bidentate, apices acuminate to acute, faces scabrous to 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.

17–35;

corollas yellow.

12–36;

corollas yellow.

85–150 (–200);

corollas yellow.

70–225;

corollas yellow.

25–37 in 2–3 series, outer appressed, apices acute to acuminate, abaxial faces scabrous or hispid.

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

8–12 × 5–9 mm;

pappi 0.5–1.5 mm.

9–14 × 6–10 mm;

pappi 1–4 mm.