Novon 9: 464. 1999.
Plants 5–18 cm; proximal, unbranched portions of primary-stems usually shorter than branches supporting heads. Leaves mostly on primary-stems (distal leaves of primary-stems densely congested) and immediately proximal to branches supporting heads. Heads usually erect in bud and fruit. Phyllaries 3–6, hirsute and/or hirtellous near folded edges. Ray-florets 3–6; laminae 2–5 mm. Disc-florets 8–20, mostly bisexual and fertile, sometimes functionally staminate. Ray cypselae not gibbous, beakless; pappi 0.2–0.5 mm. Disc cypselae 2.8–3.2 mm; pappi of 8–10 oblong or quadrate, fimbriate scales 0.2–0.5 mm. 2n = 18.
Phenology: Flowering Apr–Jun.
Habitat: Serpentine openings in chaparral
Elevation: 500–1000 m
Of conservation concern.
Harmonia hallii occurs in the southern Inner North Coast Ranges.