Ceanothus cuneatus |
Ceanothus purpureus |
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buck brush, common buckbrush, narrow-leaf buckthorn, sedge-leaf buckthorn, wedgeleaf cuneatus |
holly-leaf ceanothus |
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Habit | Shrubs, 0.5–3.5 m. Stems erect, ascending, or spreading, not rooting at nodes; branchlets grayish brown to brown, rigid or flexible, glabrate, puberulent, or tomentulose, hairs straight. | Shrubs, 1–2 m. Stems erect to ascending, not rooting at nodes; branchlets reddish brown, sometimes glaucescent, rigid, glabrate. | ||||||||||||
Leaves | usually both fascicled and not fascicled on same plant, rarely none fascicled; petiole 1–3 mm; blade flat to cupped, elliptic, oblanceolate, obovate, or orbiculate, 4–22(–30) × 3–12(–22) mm, base rounded, margins thick, not revolute, entire or denticulate distal to middle, teeth 0–9, apex obtuse, rounded, truncate, or retuse, abaxial surface pale green, glabrate or glabrous, adaxial surface green, glabrous. |
not fascicled, spreading to deflexed; petiole 0–2 mm; blade ± cupped, folded lengthwise adaxially, widely elliptic to widely obovate, 12–25 × 7–20 mm, base obtuse to cuneate, margins not revolute, spinose-dentate, teeth 7–15, apex rounded to sharply acute, abaxial surface pale green, sparsely strigillose, especially on veins, adaxial surface green to dark green, glabrous. |
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Inflorescences | axillary or terminal, 0.8–2.5 cm. |
axillary, 1.2–2.5 cm. |
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Flowers | sepals, petals, and nectary white to lavender or blue. |
sepals, petals, and nectary deep blue to purple. |
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Capsules | 4–6 mm wide, weakly lobed; valves smooth, horns subapical, prominent, erect, intermediate ridges absent. |
4–5 mm wide, lobed; valves smooth, horns subapical, prominent, slender, erect, intermediate ridges absent. |
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2n | = 24. |
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Ceanothus cuneatus |
Ceanothus purpureus |
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Phenology | Flowering Feb–Apr. | |||||||||||||
Habitat | Rocky slopes and outcrops derived from volcanic substrates, chaparral, oak woodlands. | |||||||||||||
Elevation | 100–400 m. (300–1300 ft.) | |||||||||||||
Distribution |
CA; OR; nw Mexico
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CA
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Discussion | Varieties 4 (4 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Ceanothus purpureus is endemic to the Vaca Mountains (Napa and Solano counties); it has been confused with C. jepsonii, which differs by its 6–8-merous flowers, rugose capsule horns, prominent ridges between the horns, and distribution on serpentine soils. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 12, p. 99. | FNA vol. 12, p. 106. | ||||||||||||
Parent taxa | Rhamnaceae > Ceanothus > subg. Cerastes | Rhamnaceae > Ceanothus > subg. Cerastes | ||||||||||||
Sibling taxa | ||||||||||||||
Subordinate taxa | ||||||||||||||
Synonyms | Rhamnus cuneata | |||||||||||||
Name authority | (Hooker) Nuttall: in J. Torrey and A. Gray, Fl. N. Amer. 1: 267. (1838) | Jepson: Fl. W. Calif., 258. (1901) — (as purpurea) | ||||||||||||
Web links |