Jepson Flora Project: Jepson Interchange    

link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

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



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]



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.


C. tomentosus Parry

Plant erect, < 3 m
Stem: twigs round, ± rusty-tomentose, becoming gray-brown or reddish
Leaves alternate, evergreen, < 3 cm; stipules deciduous; petiole < 5 mm; blade ovate to elliptic, 3- or 1-ribbed from base, tip obtuse, margin gland-serrate, upper surface dark green, finely hairy, lower light or dark tomentose
Inflorescence panicle-like, < 9 cm
Flower blue to ± white
Fruit ± 4 mm, sticky when young, shallowly lobed; valves crested
Chromosomes: 2n=24
Ecology: Dry, shrubby slopes, scattered
Elevation: < 1500 m.
Bioregional distribution: n&c Sierra Nevada, South Coast, San Bernardino Mountains, Peninsular Ranges
Distribution outside California: n Baja California
Plants with leaf margin glandular-dentate, lower surface gray-green, hairy especially on veins, not tomentose, from < 1100 m in SCo, SnBr, PR, n Baja CA, have been called var. olivaceus Jeps
Horticultural information: DRN: 7, 15, 16, 17, 19, 20, 21, 22, 23, 24 &IRR: 14, 18.

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