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FNA | Family List | FNA Vol. 12 | Rhamnaceae

43b. Ceanothus prostratus Bentham var. occidentalis McMinn in M. van Rensselaer and H. McMinn, Ceanothus. 262. 1942.
[C E]

Cobb Mountain ceanothus Cobb Mountain ceanothus

Ceanothus divergens Parry subsp. occidentalis (McMinn) Abrams

Shrubs, 0.1–0.3 m, matlike to moundlike. Stems prostrate, spreading, or ascending. Leaf blades slightly folded lengthwise adaxially, margins ± wavy, teeth 5–9. Capsule horns spreading, not conspicuously rugose. 2n = 24.

Flowering Apr–May. Gravelly or rocky soils derived from volcanic substrates, open flats and ridges, conifer forests; of conservation concern; 800–1400 m; Calif.

Variety occidentalis is known from only a few localities in the mountains of Lake, Mendocino, Napa, and Sonoma counties. L. Abrams and R. S. Ferris (1923–1960, vol. 3) treated it as part of Ceanothus divergens, based partly on leaf morphology, but its life form and fruit morphology suggest a closer relationship to C. prostratus.


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