[Wood Sorrels of the Cascade Mountains of Oregon and Washington]

Great Oxalis, Great Wood-sorrel, Threeleaf Wood-sorrel, Trillium-leaved Oxalis, Trillium-leaf Wood Sorrel, Trillium-leaf Wood-sorrel

Oxalis trilliifolia

Synonym: Hesperoxalis trilliifolia

Great Oxalis, Trillium-leaved Oxalis, Trillium-leaf Wood Sorrel: Oxalis trilliifolia

Great oxalis as seen along the Angels Rest Trail in the western Columbia River Gorge........July 5, 2009.

Great Oxalis, Great Wood-sorrel, Threeleaf Wood-sorrel, Trillium-leaved Oxalis, Trillium-leaf Wood Sorrel, Trillium-leaf Wood-sorrel: Oxalis trilliifolia (Synonym: Hesperoxalis trilliifolia) - Great Oxalis, Great Wood-sorrel, Threeleaf Wood-sorrel, Trillium-leaved Oxalis, Trillium-leaf Wood Sorrel, Trillium-leaf Wood-sorrel: Oxalis trilliifolia (Synonym: Hesperoxalis trilliifolia)

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.

Flowers and seed pods of Great Oxalis, Trillium-leaved Oxalis, Trillium-leaf Wood Sorrel: Oxalis trilliifolia

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.

Flowers of Great Oxalis, Great Wood-sorrel, Threeleaf Wood-sorrel, Trillium-leaved Oxalis, Trillium-leaf Wood Sorrel, Trillium-leaf Wood-sorrel: Oxalis trilliifolia -- Corolla and sepals of Great Oxalis, Great Wood-sorrel, Threeleaf Wood-sorrel, Trillium-leaved Oxalis, Trillium-leaf Wood Sorrel, Trillium-leaf Wood-sorrel: Oxalis trilliifolia

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, Great Wood-sorrel, Threeleaf Wood-sorrel, Trillium-leaved Oxalis, Trillium-leaf Wood Sorrel, Trillium-leaf Wood-sorrel: Oxalis trilliifolia (Synonym: Hesperoxalis trilliifolia)

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.

"Shamrock" leaf of Great Oxalis, Trillium-leaved Oxalis, Trillium-leaf Wood Sorrel: Oxalis trilliifolia

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, Great Wood-sorrel, Threeleaf Wood-sorrel, Trillium-leaved Oxalis, Trillium-leaf Wood Sorrel, Trillium-leaf Wood-sorrel: Oxalis trilliifolia (Synonym: Hesperoxalis trilliifolia)

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.

Paul Slichter