Flora of North America species comparison

(usually yellow-brown or greenish, sometimes glaucous) erect, glabrous, hispid, ± hirsute, or scabrous.

(green or purplish) erect, glabrous.

cauline; all or mostly opposite to mostly alternate;

petioles 0.5–1.5 cm;

blades light to dark green, 3-nerved (distal to bases) ± lanceolate to ± ovate, 4–20 × 0.8–4 cm, bases cuneate, margins entire or ± serrate (flat), abaxial faces hispid to hispidulous or tomentulose to villous-tomentose, gland-dotted.

mostly basal; opposite;

petioles 0–1 cm;

blades linear to narrowly obovate, 13–30 × 0.7–2 cm, bases cuneate, margins entire or obscurely serrate, faces glabrous, not gland-dotted (cauline smaller).

1–18 cm.

4–11 cm.

hemispheric, 10–20 mm diam.

hemispheric, 8–12 mm diam.

10–21;

laminae 20–25 mm (abaxial faces not gland-dotted).

8–13;

laminae 10–19 mm (abaxial faces not gland-dotted).

60+;

corollas 5–7 mm, lobes yellow;

anthers dark brown to black, appendages yellow.

35+;

corollas 4.2–5.5 mm, lobes yellow;

anthers dark, appendages dark.

30–38 (loose, spreading), lanceolate to lance-ovate, 8–16 × 1.5–3 mm, (margins ciliate) apices acute to acuminate, abaxial faces usually ± strigose, rarely glabrate, not gland-dotted.

18–23, linear-linear, 5–11 × 1–2.5 mm, (margins ciliolate) apices ± attenuate, abaxial faces glabrate or glabrous.

1–6.

3–12.

3–5 mm, glabrate;

pappi of 2 aristate scales 2.2–4.5 mm plus 0–2 lanceolate scales 0.5–1 mm.

2–3 mm, glabrate;

pappi of 2 aristate scales 1.4–2.5 mm.

8–12 mm, 3-toothed.

6–8 mm, weakly 3-toothed (apices hairy).

= 34 (subspecies unknown).

= 34.