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. cuneatus (Hook.) Nutt.

Plant prostrate to erect, < 3 m
Stem: twigs round, gray to brown, generally glabrous, becoming gray
Leaves opposite, clustered or not, evergreen, < 3.2 cm, flat; stipules persistent; petiole ± 0–3 mm; blade oblong, oblanceolate, or obovate to roundish, 1-ribbed from base, firm, tip obtuse to notched, margin entire or with spine-like teeth, upper surface dull to shiny green, ± glabrous, lower surface ± hairy on veins
Inflorescence raceme-like, < 2.5 cm
Flower white, pale blue, blue, or lavender
Fruit 4–6 mm, generally with horns near top; ridges 0 or minute
Ecology: Dry fans, slopes, ridges
Elevation: < 1800 m.
Bioregional distribution: California Floristic Province (except Great Central Valley)
Distribution outside California: Oregon, n Baja California

Native

var. cuneatus

BUCK BRUSH

Plant generally erect, rarely prostrate, < 3 m
Stem: twigs generally light gray, becoming gray
Leaf < 3.2 cm; petiole < 3 mm; blade oblanceolate to obovate or rounded, entire, upper surface generally dull green, glabrous, lower minutely canescent
Flower white or pale blue to lavender
Fruit 4–6 mm; horns minute, some slender; ridges 0
Chromosomes: 2n=24
Ecology: Common. Dry, rocky slopes, ridges, including sands, serpentine
Elevation: < 1800 m.
Bioregional distribution: California Floristic Province (except Great Central Valley)
Synonyms: var. dubius J.T. Howell; var. submontanus (Rose) McMinn; C. ramulosus (Greene) McMinn var. r
Horticultural information: DRN, DRY, SUN: 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24; CVS; STBL.

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bioregional map for CEANOTHUS%20cuneatus%20var.%20cuneatus being generated
 
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 cuneatus var. cuneatus
Retrieve dichotomous key for Ceanothus
Overlay Consortium of California Herbaria specimen data by county on this map
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