Ceanothus cuneatus |
Ceanothus incanus |
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buck brush, common buckbrush, narrow-leaf buckthorn, sedge-leaf buckthorn, wedgeleaf cuneatus |
coast whitethorn |
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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, evergreen, 1–4 m. Stems erect, not rooting at nodes; branchlets light gray, glaucous, thorn-tipped or not, round or slightly angled in cross section, rigid, puberulent, glabrescent. | ||||||||||||
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; petiole 3–12 mm; blade flat, elliptic, ovate, or suborbiculate, 20–60 × 10–30 mm, base rounded or subcordate, margins entire, sometimes minutely glandular-denticulate above middle, glands 26–52, apex obtuse, abaxial surface pale green, appressed-puberulent, glabrescent, adaxial surface grayish green, dull, glabrate; 3-veined from base. |
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Inflorescences | axillary or terminal, 0.8–2.5 cm. |
axillary, usually paniclelike, sometimes racemelike, 3–6 cm. |
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Flowers | sepals, petals, and nectary white to lavender or blue. |
sepals, petals, and nectary usually white to cream, sometimes pink. |
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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 rugose, viscid when young, not or weakly crested. |
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2n | = 24. |
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Ceanothus cuneatus |
Ceanothus incanus |
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Phenology | Flowering Apr–Jun. | |||||||||||||
Habitat | Flats, slopes, chaparral, open sites in conifer and mixed evergreen forests. | |||||||||||||
Elevation | 60–1000 m. (200–3300 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 incanus is restricted to the Klamath and Santa Cruz mountains and North Coast Ranges of California. Some populations are evidently polymorphic for the presence of thorn-tipped or non-thorn-tipped branchlets (F. K. Klein 1970). Putative hybrids with C. papillosus and C. parryi have been reported (H. McMinn 1944); hybrids with C. thyrsiflorus have been called C. ×vanrensselaeri Roof. (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. 86. | ||||||||||||
Parent taxa | Rhamnaceae > Ceanothus > subg. Cerastes | Rhamnaceae > Ceanothus > subg. Ceanothus | ||||||||||||
Sibling taxa | ||||||||||||||
Subordinate taxa | ||||||||||||||
Synonyms | Rhamnus cuneata | |||||||||||||
Name authority | (Hooker) Nuttall: in J. Torrey and A. Gray, Fl. N. Amer. 1: 267. (1838) | Torrey & A. Gray: Fl. N. Amer. 1: 265. (1838) | ||||||||||||
Web links |