E-Flora BC: Electronic Atlas of the Flora of British Columbia

Oxalis oregana Nutt.
redwood sorrel (redwood-sorrel)
Oxalidaceae (Wood-Sorrel family)

Introduction to Vascular Plants

© Lydia Dani  Email the photographer   (Photo ID #74925)

E-Flora BC Static Map
Distribution of Oxalis oregana
Click here to view our interactive map and legend
Details about map content are available here
Click on the map dots to view record details.


Redwood sorrel is a herbaceous perennial species that is found in North America from British Columbia south to California. In British Columbia it is rarely found on the Queen Charlotte Islands (Haida Gwaii) and the west coast of Vancouver Island, in the Coastal Western Hemlock BEC zone (Douglas et al. 1999). The leaves are light-responsive, opening in direct sun and closing when shaded (Wikipedia 2012). The ecological framework information for this species on E-Flora BC shows that it is generally found at an elevation of 25 m, but may be found up to an elevation of 80 m.

Species Information

Click on the image below to view an expanded illustration for this species.

Perennial herb from a scaly rhizome, 5-20 cm tall; stems ascending to erect, several, simple, brown-hairy, 5-15 cm long.
All basal, numerous, clover-like, the blades 1-4.5 cm long, stalks brownish-hairy, 3-20 cm long, leaflets broadly heart-shaped, folded towards each other.
Inflorescence of single terminal flowers; petals white to pinkish, 13-20 mm long, entire; sepals 5-10 mm long.
Capsules, egg-shaped, 7-9 mm long, hairy; seeds almond-shaped, 3.5-4 mm long, longitudinally marked.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist forests in the lowland zone; rare on the Queen Charlotte Islands and W coast of Vancouver Island; S to CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Oxalis oregana

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class




Elevation (metres) 0 20 80
Slope Gradient (%) 0 0 1
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
5 5 7
Modal Nutrient Regime
Number of field plots
 species was recorded in:
Modal BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in: CWH(5)


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is cool mesothermal.

Synonyms and Alternate Names

Oxalis acetosella subsp. oregana (Nutt.) D. Löve
Oxalis oregana var. smallii (R. Knuth) M. Peck

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References