[Wood Sorrels: The Genus Oxalis in the Cascade Mountains of Oregon and Washington]

Western Wood Sorrel, Oregon Wood Sorrel, Redwood Sorrel, Redwood-sorrel, Sour Grass

Oxalis oregana

Synonyms: Oxalis oregana var. oregana, Oxalis oregana var. smallii

Oregon Wood Sorrel, Redwood Sorrel, Redwood-sorrel, Sour Grass: Oxalis oregana (Synonyms: Oxalis oregana var. oregana, Oxalis oregana var. smallii)

Western wood sorrel blooming along the Lewis River Trail #31 between Curly Creek Falls and Bolt Camp Shelter, Gifford Pinchot National Forest.........May 3, 2015.

Oregon Wood Sorrel, Redwood Sorrel, Redwood-sorrel, Sour Grass: Oxalis oregana (Synonyms: Oxalis oregana var. oregana, Oxalis oregana var. smallii)

Oregon wood sorrel as seen at the author's garden in Gresham, OR........May 11, 2009. This variety of wood sorrel makes an attractive ground cover for the woodland garden to the west of the Cascade Mts.

Oregon Wood Sorrel, Redwood Sorrel, Redwood-sorrel, Sour Grass: Oxalis oregana (Synonyms: Oxalis oregana var. oregana, Oxalis oregana var. smallii) -- Oregon Wood Sorrel, Redwood Sorrel, Redwood-sorrel, Sour Grass: Oxalis oregana (Synonyms: Oxalis oregana var. oregana, Oxalis oregana var. smallii)

Close-ups of the flower and "shamrock" leaf and flower of western wood sorrel as seen in the author's garden in Gresham, OR........May 5, 2009.
Paul Slichter