Flora of North America species comparison

erect to prostrate, glabrous or glabrate.

erect, glabrous proximally, distally glabrate, scabrellous, or strigillose (glaucous).

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.

cauline; opposite (proximal) or alternate;

petioles (1–)2–5 cm;

blades (light to dark green, 3-nerved distal to bases) lanceolate to lance-ovate, 10–32 × (1.2–)4–9 cm, bases cuneate, margins usually coarsely to shallowly serrate, rarely subentire (flat), abaxial faces puberulent to tomentulose, gland-dotted.

2–10 cm.

0.3–10 cm.

hemispheric, 12–28 mm diam.

12–16;

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

14–20;

laminae 23–40 mm.

40+;

corollas 6.5–7.5 mm, lobes yellow;

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

100+;

corollas 5–6 mm, lobes yellow;

anthers dark brown to black, appendages yellow.

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

25–30 (loose, spreading), lance-linear, 10–14 × 1.5–2.5 mm (subequal), (margins ± ciliate) apices attenuate, abaxial faces glabrous or puberulent, not gland-dotted.

1–3.

3–15+.

4–5 mm, glabrate;

pappi of 2 aristate scales 3–4.2 mm.

3–4 mm, glabrate;

pappi of 2 aristate scales 1.9–2.5 mm.

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

7–8 mm, entire or 3-toothed (apices acuminate, ± hairy).

-lucres broadly hemispheric, 15–25 mm diam.

= 34.

= 34.