Ceanothus masonii |
Ceanothus otayensis |
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Bolinas ceanothus, Mason's ceanothus |
Otay Mountain ceanothus |
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Habit | Shrubs, 0.6–2 m. Stems erect to ascending, not rooting at nodes; branchlets dark brown, rigid, ± tomentulose. | 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 1–2 mm; blade flat, usually elliptic or oval, sometimes suborbiculate, 7–21 × 4–13 mm, base rounded to ± cuneate, margins not revolute, denticulate most of length, teeth 9–17, apex obtuse, rounded to truncate, abaxial surface pale green to grayish green, strigose on veins, glabrate, adaxial surface dark green, glabrous. |
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, 1–2.5 cm. |
axillary or terminal, 0.6–1.8 cm. |
Flowers | sepals, petals, and nectary deep blue to purple. |
sepals and petals white; nectary tan to brown. |
Capsules | 3–4 mm wide, not lobed; valves smooth, horns apical, minute, not rugose, intermediate ridges absent. |
4–6 mm wide, weakly lobed; valves smooth, horns minute or absent, intermediate ridges absent. |
2n | = 24. |
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Ceanothus masonii |
Ceanothus otayensis |
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Phenology | Flowering Feb–Apr. | Flowering Jan–Apr. |
Habitat | Soils derived from serpentine, chaparral, pine forests. | Rocky slopes, chaparral. |
Elevation | 100–500 m. (300–1600 ft.) | 500–1100 m. (1600–3600 ft.) |
Distribution |
CA
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CA; Mexico (Baja California) |
Discussion | Ceanothus masonii occurs only at a few localities on Bolinas Ridge, Marin County. With the exception of its leaf morphology, it bears a close resemblance to C. gloriosus var. exaltatus. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 12, p. 103. | FNA vol. 12, p. 108. |
Parent taxa | Rhamnaceae > Ceanothus > subg. Cerastes | Rhamnaceae > Ceanothus > subg. Cerastes |
Sibling taxa | ||
Name authority | McMinn: Madroño 6: 171. (1942) | McMinn: in M. van Rensselaer and H. McMinn, Ceanothus, 273, fig. 102. (1942) — as hybrid |
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