Ceanothus cuneatus |
Ceanothus pinetorum |
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buck brush, common buckbrush, narrow-leaf buckthorn, sedge-leaf buckthorn, wedgeleaf cuneatus |
Coville ceanothus, Coville's ceanothus, Kern 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, 0.5–1.5 m, sometimes moundlike. | ||||||||||||
Stems | erect, spreading, or weakly ascending, sometimes arcuate, rooting at proximal nodes; branchlets reddish to grayish brown, sometimes glaucous, rigid, glabrous or sparsely puberulent. |
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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. |
sometimes fascicled, not crowded; petiole 1–3 mm; blade flat to slightly cupped, slightly folded lengthwise adaxially, widely elliptic to suborbiculate, 10–20 × 8–19 mm, base rounded, margins thick to slightly revolute, dentate to denticulate most of length, teeth 9–15, apex rounded, abaxial surface pale green, glabrous except on veins, adaxial surface dark green, glabrous. |
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Inflorescences | axillary or terminal, 0.8–2.5 cm. |
axillary, 1.2–2.1 cm. |
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Flowers | sepals, petals, and nectary white to lavender or blue. |
sepals, petals, and nectary pale blue to blue. |
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Capsules | 4–6 mm wide, weakly lobed; valves smooth, horns subapical, prominent, erect, intermediate ridges absent. |
6–9 mm wide, weakly lobed; valves smooth to rugulose, horns subapical, prominent, erect, rugose, intermediate ridges present. |
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Ceanothus cuneatus |
Ceanothus pinetorum |
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Phenology | Flowering May–Jun. | |||||||||||||
Habitat | Rocky granitic or metamorphic slopes and ridges, open pine forests. | |||||||||||||
Elevation | 1600–2600 m. (5200–8500 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 pinetorum occurs disjunctly in the southern Trinity Mountains (Shasta and Trinity counties) and in the southern Sierra Nevada (Kern and Tulare counties). (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) | Coville: Contr. U.S. Natl. Herb. 4: 80, plate 6. (1893) | ||||||||||||
Web links |