Raillardella muirii A. Gray in W. H. Brewer et al., Bot. California 1: 618. 1876; Raillardiopsis muirii (A. Gray) Rydberg

Leaf blades 9–42 × 2–4 mm. Invo-lucres 8–13 × 5–10+ mm. Disc corollas 6.5–10 mm. Cypselae black, 4–7.5 mm; pappi 5–11 mm. 2n = 16.

Flowering Jun–Oct. On granitic soils, openings in forests; of conservation concern; 1100–2500 m; Calif.

Carlquistia muirii is known only from granitic substrates in the southern Sierra Nevada and Santa Lucia Range (Ventana Double Cone). Major disjunctions among the populations of C. muirii, a self-incompatible tarweed, may be explained by vicariance, ancient dispersal, or both (B. G. Baldwin and D. W. Kyhos 1990).