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Frangula purshiana
Frangula purshiana (DC.) A. Gray
Cascara Buckthorn, Cascara
Rhamnaceae (Buckthorn Family)
Synonym(s): Rhamnus purshiana
USDA Symbol: FRPU7
USDA Native Status: L48 (N), CAN (N)
Large shrub or small tree with short trunk and crown of many stout, upright branches.
The bark is the source of the laxative drug, Cascara Sagrada, meaning "sacred bark" in Spanish. It is harvested commercially in Washington and Oregon by stripping bark from wild trees. When a tree is cut down, several sprouts grow from the stump. The berries are consumed by songbirds and bears, raccoons, and other mammals; hence this species is sometimes called "Bearberry."
From the Image Gallery
No images of this plant
Plant Characteristics
Duration: PerennialHabit: Shrub , Tree
Leaf Complexity: Simple
Fruit Type: Drupe
Size Notes: Up to about 35 feet tall.
Leaf: Dark Green
Fruit: Black, Blue
Bloom Information
Bloom Color: WhiteBloom Time: Mar , Apr , May , Jun , Jul
Distribution
USA: CA , ID , MT , OR , WACanada: BC
Native Distribution: S. British Columbia south to N. California; also Rocky Mountain region south to N. Idaho and W. Montana; to 5000' (1524 m).
Native Habitat: Moist soils in open areas, along roadsides, and in understory of coniferous and mixed evergreen forests.
Growing Conditions
Water Use: MediumLight Requirement: Shade
Soil Moisture: Moist
CaCO3 Tolerance: Low
Soil Description: Loam
Benefit
Use Medicinal: The bark was boiled and the tea was drunk as a strong laxative by the Nuxalk, Coast Salish, Quileute, Nuu-chah-nulth, Keakwaka'wakw and other groups. Carscara has been scientifically substantiated as an addictive laxative.Warning: POISONOUS PARTS: Berries. Low toxicity if eaten. Symptoms include nausea, vomiting, and diarrhea. Toxic Principle: Glycosides. (Poisonous Plants of N.C.)
Attracts: Birds
Find Seed or Plants
View propagation protocol from Native Plants Network.
National Wetland Indicator Status
Region: | AGCP | AK | AW | CB | EMP | GP | HI | MW | NCNE | WMVE |
Status: | FACU | FACU | FAC |
From the National Organizations Directory
According to the species list provided by Affiliate Organizations, this plant is on display at the following locations:Santa Barbara Botanic Garden - Santa Barbara, CA
Web Reference
Webref 30 - Calflora (2018) CalfloraWebref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter
Additional resources
USDA: Find Frangula purshiana in USDA PlantsFNA: Find Frangula purshiana in the Flora of North America (if available)
Google: Search Google for Frangula purshiana
Metadata
Record Modified: 2023-05-08Research By: TWC Staff