Limestone Barrens Sandwort, a native species, has been added to the USWildflowers database (07/12/2017.) Scientific name is Mononeuria patula.
Photo below was taken in the Couchville Cedar Glade State Natural Area, Davidson County, TN on May 11, 2017.
Go to the Limestone Barrens Sandwort detail page for more information and photos.
Lime Barren Sandwort – Mononeuria patula