Oxalis obtriangulata
A creeping woodland wood-sorrel of Korea, Japan and the Russian Far East, related to the European Oxalis acetosella but with larger leaflets and white to pale pink spring flowers. It grows on the cool, humid floor of deciduous and mixed mountain forest and needs a cold, frozen winter dormancy.
Where it grows wild
Moist, shady floor of deciduous and mixed broadleaf-conifer forest in mountains, often in humus-rich soil along slopes and ravines. It flowers in spring before the canopy fully closes and then grows on in deep summer shade.
Most Korean records come from mountain forest; the weighted climate sites sit at about 150 to 900 m.
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Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app. Photo from Wikimedia Commons, used under its CC BY-SA 3.0 licence, unmodified.