Flora of North America species comparison

erect or ascending, glabrous or sparsely puberulent (in decurrent lines).

erect, glabrous.

linear to narrowly elliptic, 10–50 × 1–5 mm, margins with 1–3 pairs of setae, faces glabrous or sparsely puberulent (dotted on margins with round oil-glands 0.2–0.7 mm).

narrowly linear, 10–50 × 1–2 mm (sometimes smaller, bractlike distally), margins with 0–1 pairs of setae, faces glabrous (abaxial dotted near each margin with a row of elliptic oil-glands ca. 0.3 mm).

20–80 mm.

10–80 mm.

campanulate.

cylindric.

8(–13);

corollas 5–11 mm.

5;

corollas 6–11 mm (laminae often dotted near margins with inconspicuous oil-glands).

(7–)20–55;

corollas 3.5–5 mm (2-lipped).

4–7;

corollas 3.7–6 mm (lobes 5, equal, each with 1 subterminal oil-gland).

distinct, oblong or narrowly obovate, 4–7 × 1–2 mm (dotted with 0–2, subterminal oil-glands plus 2–4 pairs of inconspicuous, round to narrowly elliptic, submarginal oil-glands).

distinct, linear-oblong, 5–9.5 × 1–1.5 mm (each dotted with 1–2 swollen, subapical oil-glands and a row of 2–3 linear, submarginal oil-glands on each side of midrib).

borne singly or in open, cymiform arrays.

borne singly or in open, cymiform arrays.

3–4.5 mm, strigillose or short-pilose;

ray pappi of 1–4, antrorsely barbed awns 1–4 mm or coroniform;

disc pappi of 15–30, antrorsely barbed bristles 2.5–5 mm or coroniform.

3.5–5 mm, puberulent (hair tips blunt);

pappi of 1–3 stout awns 1–2 mm or coroniform.

= 24 (as P. palmeri).

= 24.