Ceanothus prostratus var. occidentalis

McMinn in M. van Rensselaer and H. McMinn

Ceanothus, 262. 1942.

Common names: Cobb Mountain ceanothus
EndemicConservation concern
Synonyms: Ceanothus divergens subsp. occidentalis (McMinn) Abrams
Treatment appears in FNA Volume 12. Treatment on page 105. Mentioned on page 104.

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.


Phenology: Flowering Apr–May.
Habitat: Gravelly or rocky soils derived from volcanic substrates, open flats and ridges, conifer forests.
Elevation: 800–1400 m.

Discussion

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.

Selected References

None.

Lower Taxa

None.

"thick" is not a number.

perigynous +  and epigynous +
Clifford L. Schmidt† +  and Dieter H. Wilken +
McMinn in M. van Rensselaer and H. McMinn +
cuneate +
Ceanothus sect. Cerastes +
3-veined +  and veined +
not gland-dotted +
0.6 cm6 mm <br />0.006 m <br /> (3 cm30 mm <br />0.03 m <br />) +
3[-5]-veined +  and pinnate +
spinulose +, spinose +, serrate +  and entire +
denticulate +, dentate +, crenulate +, crenate +  and serrulate +
elliptic;obovate +
4mm;16mm +
not thorn-tipped +
glabrescent +  and puberulent +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
Cobb Mountain ceanothus +
800–1400 m. +
Gravelly or rocky soils derived from volcanic substrates, open flats and ridges, conifer forests. +
spreading +  and erect +
subapical +
not +  and rugose +
free +  and adnate +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
unisexual +  and bisexual +
0.9 cm9 mm <br />0.009 m <br /> (2 cm20 mm <br />0.02 m <br />) +
deciduous +  and persistent +
usually longer +
dentate to spinose-dentate +
pale;deep blue or purplish blue +
intrastaminal +
superior +  and inferior +
not fleshy +
perigynous +  and epigynous +
adnate +  and distinct +
6 +  and 5 +
Clawed (?) +, Obovate (?) +  and Spatulate (?) +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Flowering Apr–May. +
2-4-carpellate +
intermediate +
pink +, usually white +  and cream blue or purple +
distinct +
spreading +  and incurved +
6 +  and 5 +
keeled;lanceolate;deltate +
Endemic +  and Conservation concern +
ascending +, spreading +  and prostrate +
Ceanothus divergens subsp. occidentalis +
Ceanothus prostratus var. occidentalis +
Ceanothus prostratus +
variety +
paniclelike +  and racemelike +
not gland-tipped +
smooth +  and rugulose +
strigillose +
unarmed +  and armed +
shrub +  and matlike +
polygamous +, dioecious +  and synoecious +