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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  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

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. cordulatus Kellogg

MOUNTAIN WHITETHORN

Plant spreading to ascending, < 1.5 m, thorny
Stem: twigs round, yellow-green, puberulent, becoming light gray
Leaves alternate, evergreen, < 3 cm; stipules deciduous; petiole < 6 mm; blade ovate to elliptic, 3-ribbed from base, tip acute to obtuse, margin generally entire, upper surface light to gray-green, glabrous to puberulent, lower paler, glabrous to puberulent
Inflorescence panicle-like, < 4 cm
Flower white
Fruit < 5 mm, rough, 3-lobed; valves ± crested
Chromosomes: 2n=24
Ecology: Rocky ridges, open pine forests
Elevation: 900–2900 m.
Bioregional distribution: Klamath Ranges, North Coast Ranges, Sierra Nevada, San Gabriel Mountains, San Bernardino Mountains, San Jacinto Mountains, Desert Mountains (Panamint Mtns)
Distribution outside California: Oregon, Nevada, n Baja California
Flowering time: May–Jul
Horticultural information: DRN, DRY, SUN: 1, 2, 3, 6, 7, 14, 15, 16, 18; STBL.

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