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, petiolate;

cauline usually alternate, rarely subopposite, petiolate or sessile;

blades deltate, elliptic, linear, ovate, or rhombic, 2–40 × 1.5–26 cm, sometimes (proximal) 1–2-pinnately lobed, bases attenuate, cuneate, or truncate, ultimate margins unevenly toothed or entire (distal blades), apices acuminate to apiculate, faces scabrous to hirsute.

17–35;

corollas yellow.

14–30;

corollas white.

85–150 (–200);

corollas yellow.

70–130;

corollas white.

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

23–36 in 2–3 series, outer reflexed, apices acuminate, abaxial faces hispid.

8–12 × 5–9 mm;

pappi 0.5–1.5 mm.

12–26 × 7–12 mm;

pappi 2–5 mm.