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Rhamnus purshianus

Common name:	Cascara Sagrada	Family:	Rhamnaceae
Author:	DC.	Botanical references:	11, 60, 200
Synonyms:	Frangula purshiana ((DC.)J.G.Cooper.)
Known Hazards:	There is the suggestion that this species could be mildly poisonous[19, 65].
Range:	Western N. America - British Columbia to California.
Habitat:	Rich bottom lands and sides of canyons, usually in coniferous forests[60, 82].
Edibility Rating (1-5):	2	Medicinal Rating (1-5):	3

Other Possible Synonyms:	From various places across the web, may not be correct. See below.
	R. purshiana[B,,C,E,G,H,Sill,Smap,Spr,P] R. purshiana2[Sill]
Other Common Names:	From various places around the Web, may not be correct. See below.
	Californian Buckthorn [H], Cascara [FEIS], Cascara Buckthorn [DEN1,E,B], Cascara Sagrada [S,E,H], Kaskara Sakrada [E], Kasukarasakurada [E], Pursh's Buckthorn [P], Sacred Bark [H],
Systematics:	From a USDA Plants Database
	Order: Rhamnales. Buckthorn family
Other Range Info:	From the Ethnobotany Database
	Canada(Kwakiutl) Canada(Salish) Turkey Us Us(Amerindian) Us(Flathead)

Physical Characteristics

An evergreen tree growing to 10m by 6m . It is hardy to zone 7. It is in leaf all year, in flower from May to June, and the seeds ripen in October. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Insects. It is noted for attracting wildlife. We rate it 2/5 for edibility and 3/5 for medicinal use.

The plant prefers light (sandy), medium (loamy) and heavy (clay) soils. The plant prefers acid, neutral and basic (alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It requires moist soil.

Habitats and Possible Locations

Hedge, Woodland, Canopy, Secondary.

Edible Uses

Condiment Drink Fruit.

Fruit - raw or cooked[2, 118, 161, 257]. A thin, rather juicy flesh[82]. It is sometimes eaten[183]. There is some debate as to whether the fruit is edible or slightly toxic[226]. The fruit is about 10mm in diameter[200] and contains 2 - 3 small seeds[229].
An extract of the bark, with the bitterness removed (by drying?) is a common flavouring for soft drinks, baked goods and ice cream[183].

Medicinal Uses

Disclaimer

Laxative Purgative Tonic.

Cascara sagrada is widely used as a gentle laxative that restores tone to the bowel muscles and thus makes repeated doses unnecessary[226, 244]. It is often sold in chemists etc[226]. The bark is used, this is harvested on a commercial basis from wild trees and plantations in western N. America[226]. It should be harvested in the autumn or spring at least 12 months before it is used medicinally, in order to allow the more violent purgative effect to be mollified with age[95, 213]. Three year old bark is considered to be the best age[4]. It is considered suitable for delicate and elderly persons and is very useful in cases of chronic constipation[4].
The bark also has tonic properties, promoting gastric digestion and appetite[1, 4, 11, 21, 57, 94, 95, 165]. As well as its uses as a laxative, it is taken internally in the treatment of digestive complaints, haemorrhoids, liver problems and jaundice[238]. This remedy should be used with caution since in excess it causes vomiting and diarrhoea[238]. It should not be prescribed for pregnant or lactating women, or patients with intestinal obstruction[238]. An infusion of the bark is sometimes painted over finger nails in the hope that the bitter taste will deter the person from biting their nails[238].

We have a more details factsheet on the history and medicinal use of this plant. Email webmaster@pfaf.org for details.

Other Uses

Dye Hedge Wood.

A green dye is obtained from the bark[99, 118, 257].
Plants are sometimes grown in America as an ornamental hedge[229].
Wood - light, soft, not strong. Used for making the handles of small tools[82, 99].

Cultivation details

Succeeds in any reasonably good soil in sun or partial shade[11, 238].
This species is hardy to at least -15° c[238].
Closely related to R. frangula[11].
This species is cultivated as a medicinal plant in N. America[57, 60, 61] and is also collected from the wild[238]. It is becoming rare in the wild because of over-collection[238].
The flowers are produced in small clusters on shoots of the current year's growth[82].
A good bee plant[94].
The species in this genus are notably resistant to honey fungus[200].

Propagation

Seed - best sown in the autumn in a cold frame. Stored seed will require 1 - 2 months cold stratification at about 5° and should be sown as early in the year as possible in a cold frame or outdoor seedbed[200]. Prick out the seedlings into individual pots when they are large enough to handle, and grow them on in the greenhouse or cold frame for their first winter. Plant them out in late spring or early summer of the following year.
Cuttings of half-ripe wood, July/August in a frame[113].
Cuttings of mature wood of the current year's growth, autumn in a frame.
Layering in early spring[4].

Suppliers

For more details of plant suppliers please see our Suppliers Page which lists many more places to look.

Web References

Details of Medicinal Uses, Habitats, etc. in M. Grieve A Modern Herbal (1931) [4]
[H] Details of Scandanavian and European Common names in Henriette's names database
[E] Ethnobotany Data (common names, uses, countries) from the Ethnobotany Database.
[HP] Links, Photos, Suppliers from Hortiplex Plant Database

References for Frangula purshiana (a possible synonym).

[B] Data (Latin & Common names, other references) from the BONAP's Synonymized Checklist of the Vascular Flora of the United States, Puerto Rico, and the Virgin Islands.
[G] Data (Common Names, Uses, Distribution) from the USDA/ARS NPGS's GRIN taxonomic database.
[PHARM] Phytochemical Data (common names, uses, countries) from Dr Duke's Phytochemical Database.
[P] Data. (uses, distribution, wetland) from the USDA'a Plants database.
[V] Images from the Vascular Plant Image Gallery of the Texas A& M Bioinformatics Working Group.

References for Rhamnus purshiana (a possible synonym).

[H] Details of Scandanavian and European Common names in Henriette's names database
[E] Ethnobotany Data (common names, uses, countries) from the Ethnobotany Database.
[S] Illustration from the Southwest School of Botanical Medicine
[S] SW USA Dist. Maps from the Southwest School of Botanical Medicine
[S] Image from the Southwest School of Botanical Medicine
[S] Illustration from the Southwest School of Botanical Medicine
[C] Taxon data. from the CalFlora database.
[C] Taxon data. from the CalFlora database.
Images from the CalPhoto database.
[DEN] Data _ Photos (Good Identification info) from the Virginia Tech's Dendrology Deptarments' Tree Fact Sheets.
[FEIS] Data (Uses, Ecology, Fire Effects) from the USDA Forestry Service Fire Effects Information System.
[FEIS] Data (Uses, Ecology, Fire Effects) from the USDA Forestry Service Fire Effects Information System.

References for Rhamnus purshiana2 (a possible synonym).

[S] Illustration from the Southwest School of Botanical Medicine

References for the family Rhamnaceae.

To be included in the Flora of China.

See the PFAF Links Pages for other sources.

Also try Photos and info from the The Plants Database which has 14,000 images.

References

[1] F. Chittendon. RHS Dictionary of Plants plus Supplement. 1956 Oxford University Press 1951
Comprehensive listing of species and how to grow them. Somewhat outdated, it has been replaces in 1992 by a new dictionary (see [200]).

[2] Hedrick. U. P. Sturtevant's Edible Plants of the World. Dover Publications 1972 ISBN 0-486-20459-6
Lots of entries, quite a lot of information in most entries and references.

[4] Grieve. A Modern Herbal. Penguin 1984 ISBN 0-14-046-440-9
Not so modern (1930's?) but lots of information, mainly temperate plants.

[11] Bean. W. Trees and Shrubs Hardy in Great Britain. Vol 1 - 4 and Supplement. Murray 1981
A classic with a wealth of information on the plants, but poor on pictures.

[19] Stary. F. Poisonous Plants. Hamlyn 1983 ISBN 0-600-35666-3
Not very comprehensive, but easy reading.

[21] Lust. J. The Herb Book. Bantam books 1983 ISBN 0-553-23827-2
Lots of information tightly crammed into a fairly small book.

[57] Schery. R. W. Plants for Man.
Fairly readable but not very comprehensive. Deals with plants from around the world.

[60] Hitchcock. C. L. Vascular Plants of the Pacific Northwest. University of Washington Press 1955
A standard flora for Western N. America with lots of information on habitat etc. Five large volumes, it is not for the casual reader.

[61] Usher. G. A Dictionary of Plants Used by Man. Constable 1974 ISBN 0094579202
Forget the sexist title, this is one of the best books on the subject. Lists a very extensive range of useful plants from around the world with very brief details of the uses. Not for the casual reader.

[65] Frohne. D. and Pfänder. J. A Colour Atlas of Poisonous Plants. Wolfe 1984 ISBN 0723408394
Brilliant. Goes into technical details but in a very readable way. The best work on the subject that I've come across so far.

[82] Sargent. C. S. Manual of the Trees of N. America. Dover Publications Inc. New York. 1965 ISBN 0-486-20278-X
Two volumes, a comprehensive listing of N. American trees though a bit out of date now. Good details on habitats, some details on plant uses. Not really for the casual reader.

[94] Sweet. M. Common Edible and Useful Plants of the West. Naturegraph Co. 1962 ISBN 0-911010-54-8
Useful wild plants in Western N. America. A pocket guide.

[95] Saunders. C. F. Edible and Useful Wild Plants of the United States and Canada. Dover Publications 1976 ISBN 0-486-23310-3
Useful wild plants of America. A pocket guide.

[99] Turner. N. J. Plants in British Columbian Indian Technology. British Columbia Provincial Museum 1979 ISBN 0-7718-8117-7
Excellent and readable guide.

[113] Dirr. M. A. and Heuser. M. W. The Reference Manual of Woody Plant Propagation. Athens Ga. Varsity Press 1987 ISBN 0942375009
A very detailed book on propagating trees. Not for the casual reader.

[118] Gunther. E. Ethnobotany of Western Washington. University of Washington Press 1981 ISBN 0-295-95258-X
A small book, it is a good guide to useful plants in Western N. America.

[161] Yanovsky. E. Food Plants of the N. American Indians. Publication no. 237. U.S. Depf of Agriculture.
A comprehensive but very terse guide. Not for the casual reader.

[165] Mills. S. Y. The Dictionary of Modern Herbalism.
An excellent small herbal.

[183] Facciola. S. Cornucopia - A Source Book of Edible Plants. Kampong Publications 1990 ISBN 0-9628087-0-9
Excellent. Contains a very wide range of conventional and unconventional food plants (including tropical) and where they can be obtained (mainly N. American nurseries but also research institutes and a lot of other nurseries from around the world.

[200] Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press 1992 ISBN 0-333-47494-5
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.

[213] Weiner. M. A. Earth Medicine, Earth Food. Ballantine Books 1980 ISBN 0-449-90589-6
A nice book to read though it is difficult to look up individual plants since the book is divided into separate sections dealing with the different medicinal uses plus a section on edible plants. Common names are used instead of botanical.

[226] Lauriault. J. Identification Guide to the Trees of Canada Fitzhenry and Whiteside, Ontario. 1989 ISBN 0889025649
Very good on identification for non-experts, the book also has a lot of information on plant uses.

[229] Elias. T. The Complete Trees of N. America. Field Guide and Natural History. Van Nostrand Reinhold Co. 1980 ISBN 0442238622
A very good concise guide. Gives habitats, good descriptions, maps showing distribution and a few of the uses. It also includes the many shrubs that occasionally reach tree proportions.

[238] Bown. D. Encyclopaedia of Herbs and their Uses. Dorling Kindersley, London. 1995 ISBN 0-7513-020-31
A very well presented and informative book on herbs from around the globe. Plenty in it for both the casual reader and the serious student. Just one main quibble is the silly way of having two separate entries for each plant.

[244] Phillips. R. & Foy. N. Herbs Pan Books Ltd. London. 1990 ISBN 0-330-30725-8
Deals with all types of herbs including medicinal, culinary, scented and dye plants. Excellent photographs with quite good information on each plant.

[257] Moerman. D. Native American Ethnobotany Timber Press. Oregon. 1998 ISBN 0-88192-453-9
Very comprehensive but terse guide to the native uses of plants. Excellent bibliography, fully referenced to each plant, giving a pathway to further information. Not for the casual reader.

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Plant information taken from the Plants For A Future - Species Database. Copyright (c) 1997-2003.
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