Ceanothus diversifolius |
Ceanothus jepsonii |
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pine mat |
Jepson ceanothus, Jepson's ceanothus, musk brush |
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Habit | Shrubs, evergreen, 0.2–0.3(–0.5) m, matlike. | Shrubs, 0.5–1.5 m. Stems erect to ascending, not rooting at nodes; branchlets reddish to grayish brown, rigid, puberulent, glabrescent. | ||||
Stems | spreading, sometimes rooting at nodes; branchlets green, sometimes tinged red, not thorn-tipped, usually round, sometimes angled, in cross section, flexible, puberulent. |
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Leaves | petiole 3–11 mm; blade flat, elliptic to widely ovate, 12–45 × 6–20 mm, base obtuse to rounded, margins serrulate to denticulate, not revolute, usually not wavy, sometimes wavy, teeth 27–42, apex ± obtuse to rounded, abaxial surface pale green, pilosulous, adaxial surface green, pilosulous; usually pinnately veined, rarely 3-veined from base. |
not fascicled, deflexed; petiole 0–2 mm; blade ± cupped, slightly folded lengthwise adaxially, elliptic to ± oblong, 10–20 × 5–13 mm, base rounded, margins thick or slightly revolute, spinose-dentate, teeth 7–11, apex rounded or sharply acute, abaxial surface pale yellowish green, glabrous, adaxial surface pale green, glabrous. |
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Inflorescences | axillary, umbel-like to racemelike, 1.3–4 cm. |
axillary or terminal, 1–2 cm. |
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Flowers | sepals, petals, and nectary usually blue to pale blue, rarely white. |
sepals and petals (5–)6(–8), usually blue to lavender or white, rarely pink; nectary blue; stamens (5–)6(–8). |
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Capsules | 4–5 mm wide, weakly lobed near apex; valves smooth, crested. |
5–7 mm wide, lobed; valves rugose, horns subapical, prominent, thick, erect, rugose, intermediate ridges present. |
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Ceanothus diversifolius |
Ceanothus jepsonii |
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Phenology | Flowering Apr–Jun. | |||||
Habitat | Well-drained slopes and canyons, open to shaded sites, mixed evergreen and conifer forests. | |||||
Elevation | 700–2300 m. (2300–7500 ft.) | |||||
Distribution |
CA
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CA
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Discussion | Ceanothus diversifolius occurs in the North Coast Ranges and the western slopes of the Cascade Range and the Sierra Nevada; it often forms mats to two meters wide. Marginal teeth on young leaves are notable in having more or less persistent, narrowly conic glands, not seen elsewhere in Ceanothus. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 2 (2 in the flora). Ceanothus jepsonii, composed of two, allopatric varieties, is the only species with mostly six (rarely eight) sepals and petals, and cymules reduced to solitary flowers (M. A. Nobs 1963). T. M. Hardig et al. (2000) provided evidence showing that the two varieties may not form a monophyletic group. H. McMinn (1942) and Nobs (1963) reported putative hybrids with C. cuneatus and C. prostratus. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 12, p. 94. | FNA vol. 12, p. 106. | ||||
Parent taxa | Rhamnaceae > Ceanothus > subg. Ceanothus | Rhamnaceae > Ceanothus > subg. Cerastes | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | C. decumbens | |||||
Name authority | Kellogg: Proc. Calif. Acad. Sci. 1: 58. (1855) | Greene: Man. Bot. San Francisco, 78. (1894) | ||||
Web links |