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

Introduction to Vascular Plants


© Lydia Dani     (Photo ID #74925)


E-Flora BC Static Map

Distribution of Oxalis oregana
Click here to view the full interactive map and legend


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

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.

SourceThe Illustrated Flora of British Columbia


If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.


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)
20 0 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
# of field plots
 species was recorded in:
Modal BEC Zone Class

All BEC Zones (# of stations/zone) species was recorded in


Habitat and Range

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

SourceThe Illustrated Flora of British Columbia


Synonyms and Alternate Names:
Oxalis acetosella subsp. oregana (Nutt.) D. Löve
Oxalis oregana var. smallii (R. Knuth) M. Peck