Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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RHAMNACEAE

BUCKTHORN FAMILY

John O. Sawyer, Jr. (except Ceanothus)

Shrub, vine, tree, generally erect, often thorny
Leaves simple, generally alternate, often clustered on short-shoots, generally petioled, generally stipuled; blade often 1–3-ribbed from base
Inflorescence: cyme, panicle, or flowers solitary in axils
Flower generally bisexual, radial; hypanthium subtending, surrounding, or partly fused to ovary; sepals 4 or 5; petals 0, 4, or 5, clawed; stamens 4 or 5, alternate sepals, attached to hypanthium top, each generally fitting into a petal concavity; ovary superior or partly inferior, chambers 2–5, each 1–2-ovuled, style lobes or parts 1–3
Fruit: capsule, drupe
Genera in family: 55 genera, 900 species: especially tropical, subtropical; some cultivated (Ceanothus ; Colletia , anchor-plant; Gouania ; Phylica ; Rhamnus ; Ventilago ; Ziziphus )
Reference: [Brizicky 1965 J Arnold Arbor 45:439–463]

CEANOTHUS

CALIFORNIA-LILAC

Clifford L. Schmidt

Shrub, small tree, prostrate to erect, thorny or not
Stem: branches generally arranged as leaves
Leaves alternate or opposite, deciduous or evergreen, petioled; blade 1–3-ribbed from base, margin entire or not
Inflorescence: generally panicle-like aggregations of umbel-like, 3-flowered clusters
Flower generally < 5 mm; hypanthium surrounding fleshy disk below ovary base, in fruit thick, not splitting; sepals generally 5, lanceolate-deltate, incurved, colored like petals, persistent; petals generally 5, hooded, white to deep blue; stamens generally 5, opposite petals; ovary superior, 3-lobed, chambers 3, each 1-ovuled, style parts 3
Fruit: capsule, ± spheric, 3-valved
Seeds 3, ± 3 mm, 1 surface convex
Species in genus: 45 species: North America, especially w
Etymology: (Greek: thorny plant)
Reference: [Rensselaer & McMinn 1942 Ceanothus Santa Barbara Bot Gard 1–308]
Hybridization common (named hybrids not recognized here); hybrid forms may not key adequately.

Native

C. incanus Torr. & A. Gray

COAST WHITETHORN

Plant erect, < 4 m, generally thorny
Stem: twigs round, gray-glaucous, puberulent, not changing color
Leaves alternate, evergreen, < 6 cm; stipules deciduous; petiole < 12 mm; blade elliptic- to round-ovate, 3-ribbed from base, firm, tip obtuse, margin entire, rarely ± minutely serrate, surfaces glabrous to puberulent, upper gray-green, lower paler
Inflorescence panicle-like, < 7 cm
Flower white
Fruit < 5 mm, rough, shallowly 3-lobed at top; valve crest 0
Chromosomes: 2n=24
Ecology: Open, moist flats, slopes
Elevation: < 900 m.
Bioregional distribution: Klamath Ranges, Outer North Coast Ranges, San Francisco Bay Area
Horticultural information: DRN, SUN: 5, 15, 16, 17, 22, 23, 24 &IRR: 7, 8, 9, 14, 18, 19, 20, 21; STBL.

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bioregional map for CEANOTHUS%20incanus being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Ceanothus incanus
Retrieve dichotomous key for Ceanothus
Overlay Consortium of California Herbaria specimen data by county on this map
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