Flora of North America species comparison

erect to prostrate, glabrous or glabrate.

erect, proximally villous to strigoso-hispid, distally hispid or glabrate.

cauline; mostly opposite, petioles 0–1 cm;

blades (light to dark green, 3-nerved at bases) lance-linear to lanceolate, 5–15 × 0.5–2.5 cm, bases cuneate, margins entire, abaxial faces glabrous or scabro-hispid, gland-dotted.

mostly basal; opposite;

petioles 4–25 cm (usually winged at least 1/2 their lengths);

blades lanceolate to ovate, 7–26 × 3–10 cm, bases broadly cuneate to nearly truncate (often decurrent onto petioles), margins serrate to crenate, abaxial faces strigoso-hispid (hairs of midribs1+ mm), not gland-dotted (cauline to 8 pairs proximal to heads, ovate to elliptic, smaller).

2–10 cm.

0.3–17 cm.

hemispheric, 12–28 mm diam.

broadly hemispheric, 9–16 mm diam.

12–16;

laminae 20–35 mm (abaxial faces gland-dotted).

10–15;

laminae 15–22 mm (abaxial faces not gland-dotted).

40+;

corollas 6.5–7.5 mm, lobes yellow;

anthers usually dull orange or orange-brown, sometimes yellowish, appendages dull orange to yellowish.

75+;

corollas 4–6 mm, lobes reddish;

anthers dark, appendages dark (style branches yellow).

12–18, lanceolate, 11–18 × 1.5–3 mm, apices acute to acuminate, abaxial faces gland-dotted.

15–22, broadly ovate to oblong, 7–9 × 4–5 mm, (margins ciliolate) apices obtuse to acute, sometimes mucronate, abaxial faces usually glabrous.

1–3.

(1–)3–15+.

4–5 mm, glabrate;

pappi of 2 aristate scales 3–4.2 mm.

2.8–3 mm, glabrous or distally puberulent;

pappi of 2 aristate scales 2.5–2.8 mm.

(lanceolate) 9–13 mm, subentire or 3-toothed (apices sparsely hairy, sometimes gland-dotted).

4–5.5 mm, ± 3-toothed to entire.

= 34.

= 34.