Flora of North America species comparison

prostrate to ascending (often mat-forming, densely leafy, especially distally), puberulent (in lines or throughout).

erect, glabrous.

linear to narrowly oblanceolate, 10–40 × 1.5–7 mm, margins with 4–12 pairs of setae 1–3 mm, faces glabrous (abaxial densely dotted with round oil-glands 0.1–0.3 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).

1–2 mm.

10–80 mm.

campanulate, cylindric, or ellipsoid.

cylindric.

5;

corollas 2.5–3.5 mm (scarcely surpassing phyllaries).

5;

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

3–17;

corollas 1.8–2.5 mm (2-lipped).

4–7;

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

coherent (falling together), oblong to obovate, 5–8 × 1–3 mm (often dotted in submarginal rows and sometimes along midribs with elliptic oil-glands 0.1–0.3 mm).

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 congested, (leafy) cymiform arrays.

borne singly or in open, cymiform arrays.

2.5–4.5 mm, strigillose;

pappi of 2 (ray) or 5 (disc) lanceolate scales 1.5–2.5 mm.

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

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

= 24.

= 24.