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 Angels Rest Trail in the western Columbia River Gorge........July 5, 2009.

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.

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.
Paul Slichter