Ceanothus cyaneus |
Ceanothus dentatus |
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lakeside ceanothus, San Diego buckbrush |
cropleaf ceanothus, dwarf ceanothus, sandscrub ceanothus |
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Habit | Shrubs, evergreen, 2–5 m. Stems erect, not rooting at nodes; branchlets light green, not thorn-tipped, angled in cross section, flexible, often tuberculate (tubercles minute, brownish), puberulent, glabrescent. | Shrubs, evergreen, 0.5–1.5 m. Stems erect, ascending or spreading, not rooting at nodes; branchlets brown to reddish brown, not thorn-tipped, round in cross section, rigid, puberulent. |
Leaves | petiole 2–6 mm; blade flat, ovate-elliptic, 20–50 × 15–20 mm, base rounded, margins usually denticulate to serrulate, rarely entire, not revolute, teeth 23–58, apex acute to obtuse, abaxial surface pale green, veins puberulent, adaxial surface dark green, glabrous or sparsely puberulent; 3-veined from base. |
petiole 1–2 mm; blade flat to cupped, narrowly elliptic to narrowly oblong or linear, 5–16 × 2–8 mm, base obtuse, margins obscurely glandular-denticulate, strongly revolute, glands 14–36, apex truncate to retuse, abaxial surface pale green, villosulous to strigillose, especially on veins, adaxial surface dark green, strigillose, not glandular papillate; pinnately veined, veins not furrowed. |
Inflorescences | terminal, paniclelike, 15–30(–40) cm. |
axillary or terminal, racemelike, 1.5–3 cm. |
Flowers | sepals, petals, and nectary deep blue. |
sepals, petals, and nectary deep blue. |
Capsules | 3–5 mm wide, deeply lobed; valves smooth, weakly crested. |
2.5–4 mm wide, not lobed to weakly lobed; valves smooth, crested or not. |
2n | = 24. |
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Ceanothus cyaneus |
Ceanothus dentatus |
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Phenology | Flowering Apr–Jun. | Flowering Mar–Jun. |
Habitat | Rocky or gravelly slopes, chaparral. | Sandy soils, slopes, flats, maritime chaparral, cypress and pine forests. |
Elevation | 40–600 m. (100–2000 ft.) | 0–50 m. (0–200 ft.) |
Distribution |
CA; Mexico (Baja California)
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CA
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Discussion | Ceanothus cyaneus is known in the flora area only from San Diego County, and is threatened throughout its range. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Ceanothus dentatus is a narrow endemic, restricted to the Monterey Bay region. Some specimens of this species have been mistaken for C. papillosus. Papillose glands are restricted to leaf blade margins and are absent from adaxial leaf surfaces in C. dentatus, but are evenly distributed over the adaxial leaf surfaces in C. papillosus. Putative hybrids between C. dentatus and C. griseus have been named C. ×lobbianus Hooker (M. Van Rensselaer and H. McMinn 1942). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 12, p. 90. | FNA vol. 12, p. 92. |
Parent taxa | Rhamnaceae > Ceanothus > subg. Ceanothus | Rhamnaceae > Ceanothus > subg. Ceanothus |
Sibling taxa | ||
Synonyms | C. dentatus subsp. floribundus, C. floribundus | |
Name authority | Eastwood: Proc. Calif. Acad. Sci., ser. 4, 16: 361. (1927) | Torrey & A. Gray: Fl. N. Amer. 1: 268. (1838) |
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