California Coffeeberry

Frangula californica ssp. californica
NATIVE – CA ENDEMIC

Description (Jepson, PlantID.net)

• Eudicotyledon
  • Eudicots are a major lineage of flowering plants; see family for general characteristics
• Buckthorn Family (Rhamnaceae)
• Evergreen shrub
  • New branches have red stems
• Leaves
  • Alternate (1 leaf at each junction with stem) and simple (not divided into leaflets)
  • Smooth surface, elliptic, and leathery
  • Shiny dark green upper surface; lighter green underneath
  • Margins may be toothed
• Flowers
  • Inflorescence (flower arrangement) of many small yellow-green flowers
  • Ovary partly inferior (partly below the attachment of other flower parts)
• Fruit is a 2-seeded drupe (a fleshy fruit with usually 1 seed in a hard inner shell–a stone fruit); turns black when mature
• Grows to 15 ft.
• Lifespan may be 100-200 years

Distribution

• Native and endemic (limited) to California
  • Grows in coastal sage scrub, desert scrub, chaparral, and woodlands
  • See Calflora for statewide observations of this plant
• Grows at elevations to 9,000 ft.

Uses (San Mateo County Parks prohibits removal of any natural material)

• Wildlife
  • Fruit is a food source for many mammals and birds
• Native people
  • Berries were eaten (McMurray 1990)
  • Preparation of the inner bark for a laxative tea to counteract the binding caused by their staple food, acorns; other members of the Buckthorn family were used for this purpose as well (Tutka 2015)
  • Leaves used to treat poison oak dermatitis, as well as rheumatism
  • Extracts used to treat wounds and sores (antimicrobial properties)
• Early European settlers attempted and failed to make a coffee substitute from the seeds (Ritter 2015)
• CAUTION – leaves and bark can be toxic if ingested

Name Derivation

• Frangula (FRANG-yoo-luh) – perhaps from the Latin frangere, “to break,” referring to the brittle wood
• Coffeeberry – fruit and seeds resemble the fruit and seeds (beans) of Coffea species, in the Madder family (Rubiaceae), from which the drink coffee is made (Breen 2019)
  • Coffeeberry seeds may be roasted to create a bitter coffee substitute (Shaw 2019)

Notes

• Readily re-sprouts from root crown following fire or other disturbance
• Edgewood’s coffeeberry is classified as a subspecies
  • Subspecies rank is used to recognize geographic distinctiveness, whereas variety rank is appropriate for variants seen throughout the geographic range of the species; in practice, these two ranks are not distinct
• Previously classified in the genus Rhamnus
• Host to the fungus-like microorganism Phytophthora ramorum, which causes Sudden Oak Death (SOD)
  • At Edgewood, the 2 species known to be highly susceptible to SOD are coast live oak (Quercus agrifolia var. agrifolia) and Pacific madrone saplings (Arbutus menziesii)
  • For a complete list of known hosts and host associates see USDA Risk Analysis for Phytophthora ramorum, pp.6-9

ID Tips

• May also be confused at Edgewood with other evergreen trees/shrubs with similar leaves
  • Toyon (Heteromeles arbutifolia)
  • Pacific madrone (Arbutus menziesii)
  • California bay (Umbellularia californica)

	California Coffeeberry	Toyon	Pacific Madrone	California Bay
Growth Habit	shrub	shrub / tree	tree	tree
Height	≤ 15 ft.	≤ 30 ft.	≤ 130 ft.	≤ 148 ft.
Leaves
Margin (Edge)	smooth or finely toothed	serrated	smooth	smooth
Aromatic	no	no	no	yes

At Edgewood

• Found in chaparral, coastal scrub, and open woodlands
  • See iNaturalist for observations of Frangula californica
• Flowers May – July
• Mature fruit seen August – October

See General References

Specific References

Breen, P. 2019. Rhamnus californica. Landscape Plants. Department of Horticulture, College of Agricultural Sciences, Oregon State University.

Golden Gate National Park Conservancy. 2020. Rhamnus californica (California Coffeeberry).

McMurray, N.E. 1990. Frangula californica. Fire Effects Information System. United States Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory.

Ritter, M. 2018. California Plants: A Guide to Our Iconic Flora. Pacific Street Publishing, San Luis Obispo, California.

Shaw, H. 2019. Exploring California coffeeberries. Hunter Angler Gardener Cook.

Tutka, M. 2016. California coffeeberry Frangula californica (Eschsch.) A Gray. Plant Guide. United States Department of Agriculture, Natural Resources Conservation Service, Plant Materials Center, Lockeford, California.