Ceanothus otayensis

McMinn in M. van Rensselaer and H. McMinn

Ceanothus, 273, fig. 102. 1942.

Common names: Otay Mountain ceanothus
Conservation concern
Treatment appears in FNA Volume 12. Treatment on page 108. Mentioned on page 97.

Shrubs, 1–3.5 m. Stems erect to ascending, not rooting at nodes; branchlets grayish brown to brown, ± flexible to rigid, tomentulose. Leaves not fascicled; petiole 0–2 mm; blade flat to ± cupped, widely elliptic to obovate, 5–13 × 4–10 mm, base cuneate, margins revolute, sometimes wavy, coarsely denticulate near apex, teeth 3–5, apex truncate, retuse, or cuspidate, abaxial surface green, tomentulose, adaxial surface green, glabrous or sparsely puberulent. Inflorescences axillary or terminal, 0.6–1.8 cm. Flowers: sepals and petals white; nectary tan to brown. Capsules 4–6 mm wide, weakly lobed; valves smooth, horns minute or absent, intermediate ridges absent.


Phenology: Flowering Jan–Apr.
Habitat: Rocky slopes, chaparral.
Elevation: 500–1100 m.

Distribution

V12 819-distribution-map.jpg

Calif., Mexico (Baja California)

Discussion

Ceanothus otayensis is known from the Otay and San Miguel Mountains, southern San Diego County, with at least one locality in northern Baja California. McMinn described C. otayensis as a hybrid between C. crassifolius and C. perplexans. However, neither of the putative parents occurs sympatrically with C. otayensis, and its populations do not display the increased variation expected from hybridization.

Selected References

None.

Lower Taxa

None.

"thick" is not a number.

... more about "Ceanothus otayensis"
puberulent +  and glabrous +
perigynous +  and epigynous +
Cuspidate (?) +, Retuse (?) +  and Truncate (?) +
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 +
0.5 cm5 mm <br />0.005 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
3[-5]-veined +  and pinnate +
spinulose +, spinose +, serrate +  and entire +
denticulate +, dentate +, crenulate +, crenate +  and serrulate +
widely elliptic;obovate +
4mm;10mm +
not thorn-tipped +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Otay Mountain ceanothus +
Calif. +  and Mexico (Baja California) +
500–1100 m. +
Rocky slopes, chaparral. +
minute +
free +  and adnate +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
terminal +  and axillary +
unisexual +  and bisexual +
0.6 cm6 mm <br />0.006 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
deciduous +  and persistent +
denticulate;wavy +
intrastaminal +
superior +  and inferior +
not fleshy +
perigynous +  and epigynous +
adnate +  and distinct +
6 +  and 5 +
Clawed (?) +, Obovate (?) +  and Spatulate (?) +
0 cm0 mm <br />0 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Flowering Jan–Apr. +
2-4-carpellate +
intermediate +
distinct +
spreading +  and incurved +
6 +  and 5 +
keeled;lanceolate;deltate +
Conservation concern +
not rooting +
erect +  and ascending +
Ceanothus otayensis +
Ceanothus subg. Cerastes +
species +
paniclelike +  and racemelike +
not gland-tipped +
unarmed +  and armed +
polygamous +, dioecious +  and synoecious +