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

Great oxalis as seen at left along the Angels Rest Trail in the western Columbia River Gorge........July 5, 2009. The photo at right shows great oxalis blooming along the Lewis River Trail #31 downstream of Bolt Camp, Gifford Pinchot National Forest......June 18, 2024.

Great oxalis as seen in a small stream crossing Forest Road #93 downhill from the junction with FR #9331, Gifford Pinchot National Forest.........August 25, 2015.

A close-up of the flowers and erect seed pods of great oxalis as seen along the Angels Rest Trail in the western Columbia River Gorge.......July 5, 2009. This species can be identified by the multiple, pendant white flowers in the inflorescence.

Close-up views of the flowers of great oxalis as seen along the Angels Rest Trail in the Columbia River Gorge.........August 20, 2009.

Great oxalis as seen along the Loowit Trail #216 where it descends through old growth forest towards the south side of the South Fork Toutle River canyon, Mount Saint Helens National Volcanic Monument..........October 19, 2014.

A close-up of the "shamrock"- like leaf of great oxalis as seen along the Angels Rest Trail in the western Columbia River Gorge........July 5, 2009.

Great oxalis as seen along the Toutle Trail about one-half mile uphill to the east of McBride Lake, Mt. St. Helens National Monument..........September 13, 2015.