Ceanothus lemmonii |
Ceanothus otayensis |
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Lemmon's ceanothus |
Otay Mountain ceanothus |
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Habit | Shrubs, evergreen, 0.5–1 m. Stems ascending to spreading, not rooting at nodes; branchlets pale green to grayish green and glaucous, not thorn-tipped, round in cross section, flexible to ± rigid, sparsely villosulous. | Shrubs, 1–3.5 m. Stems erect to ascending, not rooting at nodes; branchlets grayish brown to brown, ± flexible to rigid, tomentulose. |
Leaves | petiole 2–6 mm; blade flat, narrowly elliptic to oblong-elliptic, 13–35 × 6–15 mm, base cuneate to rounded, margins serrulate to denticulate most of length, not revolute, not wavy, teeth 34–45, apex acute to obtuse, abaxial surface pale green to grayish green and glaucous, villosulous, especially on veins, adaxial surface green, strigillose; pinnately veined or weakly 3-veined from base. |
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, umbel-like to racemelike, 2–6.5 cm. |
axillary or terminal, 0.6–1.8 cm. |
Flowers | sepals, petals, and nectary pale to deep blue. |
sepals and petals white; nectary tan to brown. |
Capsules | 3–4 mm wide, lobed near apex; valves smooth, crested. |
4–6 mm wide, weakly lobed; valves smooth, horns minute or absent, intermediate ridges absent. |
2n | = 24. |
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Ceanothus lemmonii |
Ceanothus otayensis |
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Phenology | Flowering Apr–May. | Flowering Jan–Apr. |
Habitat | Rocky slopes and flats, open sites, conifer forests, oak and pine woodlands. | Rocky slopes, chaparral. |
Elevation | 200–1300 m. (700–4300 ft.) | 500–1100 m. (1600–3600 ft.) |
Distribution |
CA
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CA; Mexico (Baja California) |
Discussion | Ceanothus lemmonii occurs in the inner North Coast Ranges, Klamath Mountains, and the western slope of the Cascade Range and northern Sierra Nevada. H. McMinn (1944) reported putative hybrids with C. foliosus, C. integerrimus, and C. oliganthus var. sorediatus. (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. 94. | FNA vol. 12, p. 108. |
Parent taxa | Rhamnaceae > Ceanothus > subg. Ceanothus | Rhamnaceae > Ceanothus > subg. Cerastes |
Sibling taxa | ||
Name authority | Parry: Proc. Davenport Acad. Nat. Sci. 5: 192. (1889) — (as lemmoni) | McMinn: in M. van Rensselaer and H. McMinn, Ceanothus, 273, fig. 102. (1942) — as hybrid |
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