Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit 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. greggii A. Gray

Plant erect, < 2 m
Stem: twigs round, gray, tomentose, not changing color
Leaves opposite, evergreen; stipules persistent; petiole < 3 mm; blade especially variable in shape on individual plants, 1-ribbed from base, firm, tip obtuse to truncate, margin entire to dentate, upper surface (in our vars.) generally ± cupped, both surfaces gray-canescent
Inflorescence raceme-like, < 2 cm
Flower white
Fruit 3–5 mm; horns near middle or 0; ridges 0
Ecology: Dry slopes
Elevation: 300–2300 m.
Bioregional distribution: Tehachapi Mountain Area, Transverse Ranges, Peninsular Ranges, White and Inyo Mountains, Desert Mountains
Distribution outside California: to Utah, Texas, n Mexico

Native

var. perplexans (Trel.) Jeps.

CUPLEAF CEANOTHUS


Leaf < 2 cm; blade round to widely elliptic or obovate, sharp-toothed (generally near tip) or entire, upper surface yellow-green
Chromosomes: 2n=24
Ecology: Chaparral, pinyon/juniper woodland, yellow-pine forest
Elevation: < 2100 m.
Bioregional distribution: San Bernardino Mountains, Peninsular Ranges
Distribution outside California: n Baja California
Horticultural information: DRN, SUN: 2, 3, 7, 10, 18 &IRR: 11, 14, 19, 20, 21; STBL.

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bioregional map for CEANOTHUS%20greggii%20var.%20perplexans being generated
 
N.B. The distribution depicted here differs from that given in The Jepson Manual (1993)
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Ceanothus greggii var. perplexans
Retrieve dichotomous key for Ceanothus
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
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