Mountain Woodsorrel Photograph by Thomas R Fletcher - Pixels
Common Yellow Oxalis, Oxalis stricta L.
Smoky Mountains Wildflowers: Wood Sorrel | William Britten Photography
Mountain Wood Sorrel (Oxalis montana) | Western Carolina Botanical Club
NameThatPlant.net: Oxalis montana
Mountain Wood Sorrel, Oxalis Montana. Woodland herb, can be difficult to grow in gardens. Native to Indiana. | Organic gardening, Gardening zones, Garden help