Flora of North America species comparison

square, glabrous, hispid, or scabrous.

terete, glabrous, hirsute, hispid, or scabrous.

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 persistent or caducous, petiolate or sessile;

cauline alternate, opposite, or whorled, petiolate or sessile;

blades simple, lanceolate, falcate, or ovate, 1.5–25 × 0.5–5 cm, bases attenuate to round, margins dentate, serrate, or entire, apices acuminate, acute, or obtuse, faces glabrous, hirsute, hispid, or scabrous.

17–35;

corollas yellow.

8–21;

corollas yellow.

85–150 (–200);

corollas yellow.

35–150;

corollas yellow.

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

12–26 in 2–3 series, outer appressed or reflexed, apices acute to acuminate, abaxial faces hispid or scabrous.

8–12 × 5–9 mm;

pappi 0.5–1.5 mm.

6–15 × 4–11 mm;

pappi 0–5 mm.