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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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]



Shrub, small tree
Stem: branches alternate, flexible; twigs sometimes thorn-tipped
Leaves sometimes clustered on short-shoots, deciduous or evergreen, petioled; stipules deciduous; blade 1-ribbed from base, entire or not
Inflorescence: umbel or flowers solitary, axillary
Flower bisexual or unisexual, generally < 3 mm; hypanthium at base fused to, developing around ovary in fruit, above base deciduous; sepals 4 or 5; petals 0, 4, or 5; stamens 4 or 5; ovary appearing partly inferior, chambers 2–4, each 1–2-ovuled, style lobes 2–4
Fruit: drupe, 2–4-stoned
Species in genus: 125 species: temp, few tropical
Etymology: (Greek: name for plants of this genus)
Reference: [Wolf 1938 Rancho Santa Ana Bot Gard Monogr 1]
Some of value in medicine or as dyes.


R. tomentella Benth.


Shrub < 6 m
Stem: bark gray or red; twigs velvety; terminal buds not covered with scales
Leaves evergreen; petiole 3–10 mm; blade 20–70 mm, ovate to narrowly elliptic, thick, base acute to rounded, tip acute, rounded, or with a small point, margin entire to toothed, sometimes rolled under, lower surface tomentose, veins prominent
Inflorescence 5–60-flowered; pedicels < 20 mm
Flower bisexual; hypanthium 1–2 mm; sepals 5; petals 5
Fruit 3-stoned, 10–15 mm, black
Ecology: Chaparral, woodlands
Elevation: < 2300 m.
Bioregional distribution: s Klamath Ranges, North Coast Ranges, Cascade Range Foothills, Sierra Nevada (except n High Sierra Nevada), Sacramento Valley, San Francisco Bay Area, South Coast Ranges, Southwestern California, East of Sierra Nevada, Mojave Desert
Distribution outside California: to Nevada, New Mexico, Baja California
Several subspp. distinguishable, but intermediates are common.


subsp. ursina (Greene) Sawyer

Stem: twigs gray, tomentose
Leaf: blade 30–70 mm, elliptic or ovate, upper surface green, tip acute to rounded, margin serrate to ± entire
Ecology: Woodlands
Elevation: 1200–2100 m.
Bioregional distribution: Desert Mountains (Clark, New York, Providence mtns)
Distribution outside California: to Nevada, New Mexico
Flowering time: May–Jul
Synonyms: R. californica subsp. ursina (Greene) C. Wolf
Horticultural information: DRN, DRY, SUN: 2, 3, 7, 14, 15, 16, 17, 18, 19, 20, 21.

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bioregional map for RHAMNUS%20tomentella%20subsp.%20ursina 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 Rhamnus tomentella subsp. ursina
Retrieve dichotomous key for Rhamnus
Overlay Consortium of California Herbaria specimen data by county on this map
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