Ceanothus diversifolius |
Ceanothus masonii |
|
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pine mat |
Bolinas ceanothus, Mason's ceanothus |
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Habit | Shrubs, evergreen, 0.2–0.3(–0.5) m, matlike. | Shrubs, 0.6–2 m. Stems erect to ascending, not rooting at nodes; branchlets dark brown, rigid, ± tomentulose. |
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; 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. |
Inflorescences | axillary, umbel-like to racemelike, 1.3–4 cm. |
axillary, 1–2.5 cm. |
Flowers | sepals, petals, and nectary usually blue to pale blue, rarely white. |
sepals, petals, and nectary deep blue to purple. |
Capsules | 4–5 mm wide, weakly lobed near apex; valves smooth, crested. |
3–4 mm wide, not lobed; valves smooth, horns apical, minute, not rugose, intermediate ridges absent. |
2n | = 24. |
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Ceanothus diversifolius |
Ceanothus masonii |
|
Phenology | Flowering Apr–Jun. | Flowering Feb–Apr. |
Habitat | Well-drained slopes and canyons, open to shaded sites, mixed evergreen and conifer forests. | Soils derived from serpentine, chaparral, pine forests. |
Elevation | 700–2300 m. (2300–7500 ft.) | 100–500 m. (300–1600 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.) |
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.) |
Source | FNA vol. 12, p. 94. | FNA vol. 12, p. 103. |
Parent taxa | Rhamnaceae > Ceanothus > subg. Ceanothus | Rhamnaceae > Ceanothus > subg. Cerastes |
Sibling taxa | ||
Synonyms | C. decumbens | |
Name authority | Kellogg: Proc. Calif. Acad. Sci. 1: 58. (1855) | McMinn: Madroño 6: 171. (1942) |
Web links |