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Oxalis oregana

Common name:	Redwood Sorrel	Family:	Oxalidaceae
Author:	Nutt.	Botanical references:	60, 200
Synonyms:
Known Hazards:	The leaves contain oxalic acid, which gives them their sharp flavour. Perfectly all right in small quantities, the leaves should not be eaten in large amounts since oxalic acid can bind up the body's supply of calcium leading to nutritional deficiency. The quantity of oxalic acid will be reduced if the leaves are cooked. People with a tendency to rheumatism, arthritis, gout, kidney stones or hyperacidity should take especial caution if including this plant in their diet since it can aggravate their condition[238].
Range:	Western N. America - Washington to California.
Habitat:	Redwood forests[187]. Moist woods[60].
Edibility Rating (1-5):	2	Medicinal Rating (1-5):	1

Other Possible Synonyms:	From various places across the web, may not be correct. See below.
	O. acetosella ssp. oregana[B,P] O. oregana var. smallii[B,P]
Other Common Names:	From various places around the Web, may not be correct. See below.
	Oregon Oxalis [P], Redwood-sorrel [B],
Systematics:	From a USDA Plants Database
	Order: Geraniales. Wood-Sorrel family
Noxious, Invasive and Injurious Weeds	From USDA PLANTS database, Weeds Australia , DEFRA Injurious Weeds
	Listed as noxious/invasive for: Western Australia, Tasmaina.

Physical Characteristics

Perennial growing to 0.2m. It is hardy to zone 7. It is in flower from May to July. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Insects. We rate it 2/5 for edibility and 1/5 for medicinal use.

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

Habitats and Possible Locations

Woodland, Dappled Shade, Shady Edge, Deep Shade, Ground Cover.

Edible Uses

Leaves.

Leaves - raw or cooked[118, 183, 257]. A mass of the leaves and stems can be allowed to ferment slightly when they make a tasty dessert[183]. A sort of rhubarb pie can be made from the leaf stalks[183]. Use in moderation, see notes above on toxicity.

Medicinal Uses

Disclaimer

Antirheumatic Ophthalmic Poultice.

A decoction of the whole plant has been used as a wash in the treatment of rheumatism[257].
The fresh juice of the plant has been used as eye drops to ease sore eyes[257].
A poultice of the wilted leaves has been used as a dressing on boils, sores and on swollen areas of the skin[257].

Other Uses

Ground cover.

A good ground cover plant for a woodland garden[197, 208], though it can be invasive[60]. It needs weeding for the first year or so[197].

Cultivation details

Easily grown in a moisture-retentive humus-rich soil in shade or dappled sunlight[200]. Succeeds in dense shade[187].
Grows well in a wild or woodland garden[200]. Plants can be very invasive when in suitable conditions[60].

Propagation

Seed - best sown as soon as ripe in a cold frame. Prick out the seedlings into individual pots when they are large enough to handle and plant them out in late spring or early summer.
Division in spring. Larger divisions can be planted out direct into their permanent positions. We have found that it is better to pot up the smaller divisions and grow them on in light shade in a cold frame until they are well established before planting them out in late spring or early summer.

Suppliers

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

PFAF Web Pages

This plant is mentioned in the following web pages

Web References

[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.
[C] Taxon data. from the CalFlora database.
Images from the CalPhoto database.
[P] Data. (uses, distribution, wetland) from the USDA'a Plants database.
[HP] Links, Photos, Suppliers from Hortiplex Plant Database

References for the family Oxalidaceae.

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

[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.

[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.

[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.

[187] Phillips. R. & Rix. M. Perennials Volumes 1 and 2. Pan Books 1991 ISBN 0-330-30936-9
Photographs of over 3,000 species and cultivars of ornamental plants together with brief cultivation notes, details of habitat etc.

[197] Royal Horticultural Society. Ground Cover Plants. Cassells. 1989 ISBN 0-304-31089-1
A handy little booklet from the R.H.S.

[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.

[208] Thomas. G. S. Plants for Ground Cover J. M. Dent & Sons 1990 ISBN 0-460-12609-1
An excellent detailled book on the subject, very comprehensive.

[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.

[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.

Readers Comments

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Plant information taken from the Plants For A Future - Species Database. Copyright (c) 1997-2003.
WEB search engine by Rich Morris - Home Page- Contact Info
Blagdon Cross, Ashwater, Beaworthy, Devon, EX21 5DF, UK.
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