Oxalis oregana Nutt.
Redwood-sorrel, Oregon Wood Sorrel, Oregon Woodsorrel
Oxalidaceae (Wood-Sorrel Family)
Synonym(s): Oxalis acetosella ssp. oregana, Oxalis oregana var. smallii
USDA Symbol: OXOR
A low plant in patches, with 3 heart-shaped leaflets on each leaf and 1 funnel-shaped, white or rose-pink flower at end of each stalk; leaf and flower stalks both about the same length and attached to the plant at ground level.
This species forms lush, solid, inviting carpets on the cool floor of coastal redwood forests. The sour juice is characteristic of this genus, and gives the genus name, from the Greek oxys ("sour"). A similar species in the same general region and habitat, Great Oxalis (O. trilliifolia), has 2 or more flowers on a stalk. There are also several yellow-flowered species of Oxalis in the West, some aggressively weedy.
From the Image Gallery
Plant CharacteristicsDuration: Perennial
Leaf Arrangement: Alternate
Fruit Type: Capsule
Size Notes: Flower scapes up to about 10 inches tall.
Bloom InformationBloom Color: White , Pink , Yellow
Bloom Time: Feb , Mar , Apr , May , Jun , Jul , Aug , Sep
DistributionUSA: CA , OR , WA
Native Distribution: Coastal central California to Washington; east to the eastern side of the Cascade Mountains.
Native Habitat: Forest shade.
Growing ConditionsLight Requirement: Shade
Soil Moisture: Moist
Soil pH: Acidic (pH<6.8)
Drought Tolerance: Low
Soil Description: Does best in moist, acidic to slightly neutral soil.
PropagationPropagation Material: Root Cuttings , Seeds
Description: Divide rhizomes in early spring.
Seed Collection: Seeds appear throughout summer.
Seed Treatment: Plant seeds fresh.
Find Seed or Plants
View propagation protocol from Native Plants Network.
National Wetland Indicator Status
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
Santa Barbara Botanic Garden - Santa Barbara, CA
BibliographyBibref 928 - 100 easy-to-grow native plants for Canadian gardens (2005) Johnson, L.; A. Leyerle
Search More Titles in Bibliography
Web ReferenceWebref 30 - Calflora (2018) Calflora
Webref 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 resourcesUSDA: Find Oxalis oregana in USDA Plants
FNA: Find Oxalis oregana in the Flora of North America (if available)
Google: Search Google for Oxalis oregana
MetadataRecord Modified: 2023-04-26
Research By: TWC Staff