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Oxalis oregana Nutt.
Redwood-sorrel, Oregon Wood Sorrel
Synonym(s): Oxalis acetosella ssp. oregana, Oxalis oregana var. smallii
USDA Symbol: oxor
USDA Native Status: L48 (N), CAN (N)
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.
Bloom InformationBloom Color: White , Pink
Bloom Time: Apr , May , Jun , Jul , Aug , Sep
, WA Canada: BC Native Distribution:
Coastal central California to Washington; east to the eastern side of the Cascade Mountains. Native Habitat:
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.
National Wetland Indicator Status
|Status:|| FACU || FACU |
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
From the National Organizations Directory
According to the species list provided by Affiliate Organizations, this plant is either on display or available from the following:
Santa Barbara Botanic Garden
- Santa Barbara, CA
Record Last Modified: 2009-04-08
Research By: TWC Staff