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Key to families | Table of families and genera
Indexes to all accepted names and synonyms:
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[Perennial herb] shrub, tree, generally erect, often thorny. Leaf: simple, generally alternate, often clustered on short-shoots; stipules generally present, occasionally modified into spines; generally petioled; blade pinnate-veined or 1–5-ribbed from base. Inflorescence: cyme, panicle, umbel, or flowers 1 or clustered in axils or on short-shoots. Flower: generally bisexual, radial; hypanthium subtending, surrounding, or partly fused to ovary; sepals 4–5; petals 0, 4–5, generally clawed; stamens 0, 4–5, alternate sepals, attached to hypanthium top, each generally fitting into a petal concavity; disk (0 or) between stamens, ovary, thin to fleshy, entire or lobed, free from ovary, adherent or fused to hypanthium; ovary superior or ± inferior, chambers 2–4, 1–2-ovuled, style 1, stigma entire or 2–3-lobed. Fruit: capsule, drupe.
50–52 genera, 950 species: especially tropics, subtropics some cultivated (Ceanothus; Frangula; Rhamnus; Ziziphus). [Richardson et al. 2000 Amer J Bot 87:1309–1324] —Scientific Editors: Steve Boyd, Thomas J. Rosatti.
Unabridged references: [Brizicky 1965 J Arnold Arbor 45:439–463; Richardson et al. 2000 Kew Bull 55:311–341]
Key to Rhamnaceae
Shrub, tree-like or not, generally erect or mat- to mound-like. Stem: branches generally arranged like leaves; twigs thorn-like or not, generally not angled. Leaf: alternate or opposite, some clustered on short-shoots or not, deciduous or evergreen; stipules scale-like, thin, deciduous, or knob-like, corky, thick, base persistent; blade flat or wavy, tip generally acute to obtuse, margin thick (i.e., thicker than adjacent blade) or not, rolled under or not, wavy or not, entire or gland- or sharp-toothed, glands generally dark, teeth pale, alternate blade 1–3-ribbed from base, generally thin, opposite blade 1-ribbed from base, thick, firm. Inflorescence: umbel-, raceme-, or panicle-like aggregations of few-flowered clusters, axillary or terminal; pedicels white to deep blue or pink. Flower: conspicuous, generally < 5 mm; hypanthium surrounding fleshy disk below ovary base, in fruit thick, not splitting; sepals generally 5, lance-deltate, incurved, colored like petals, persistent; petals generally 5, blade hood-like, white to deep blue or pink; stamens generally 5, opposite petals; ovary 1/2-inferior, 3-lobed, chambers 3, each 1-ovuled, styles 3. Fruit: capsule, ± spheric, generally ± 3-lobed, generally smooth, 3-ridged or not, horned or not. Seed: 3, 2–5 mm.Key to Ceanothus
± 55 species: North America. (Greek: thorny plant) [Fross & Wilken 2006 Ceanothus. Timber Press] Hybrids common (named hybrids not recognized here), discussed in Fross & Wilken; hybrid forms do not key easily. As recircumscribed here, Ceanothus greggii A. Gray restricted to Mexico.
Plant erect (mound-like), generally open. Stem: ascending to spreading, occasionally arched, not rooting at nodes; twigs generally brown to gray-brown, generally glabrous to ± puberulent. Leaf: opposite, some clustered or not, evergreen; stipules knob-like; petiole < 3 mm, generally glabrous to ± puberulent; blade 6–30 mm, 3–18 mm wide, elliptic to ± round, dull green, adaxially glabrous, abaxially paler, glabrous to ± strigose, tip obtuse to notched, margin entire or teeth ± sharp. Inflorescence: umbel-like, generally 1–2 cm. Flower: white, pale blue, blue, or lavender. Fruit: 4–6 mm wide, ± 3-ridged distally; horns 0.5–2 mm.
2n=24. [Online Interchange]
Plant < 3 m. Stem: generally ascending to spreading; twigs generally gray-brown. Leaf: some occasionally clustered; blade elliptic, oblanceolate, or obovate, tip acute to ± rounded, margin generally entire. Flower: generally white.
Sandy to rocky flats, slopes, ridges; < 2133 m. California Floristic Province (except Channel Islands), Modoc Plateau; Oregon, northern Baja California. Intergrades with Ceanothus cuneatus var. ramulosus in southern Outer South Coast Ranges, western Transverse Ranges. Were they to be recognized taxonomically, plants from Santa Cruz Mountains with leaf blades 15–27 mm, 9–20 mm wide, wide-elliptic to -obovate, would be assignable to Ceanothus cuneatus var. dubius J.T. Howell; study needed. Feb–May [Online Interchange]
Previous taxon: Ceanothus cuneatus
Next taxon: Ceanothus cuneatus var. fascicularis
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Mar 9 2014
Citation for this treatment: [Author of taxon treatment] 2012. Ceanothus, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=75440, accessed on Mar 9 2014
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|Ceanothus cuneatus var. cuneatus|
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Gladys Lucille Smith © 1999 California Academy of Sciences
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