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This plant was previously listed as Viola sororia f. priceana. It is now listed as V. communis f. priceana - see Harvey Ballard's explanation here: https://people.ohio.edu/ballardh/vgpena/. As he notes on that page, "Two floral color forms comprise this species, the typical f. communis with violet to purple corollas and indistinct purple nectarguides, and the Confederate Violet. The latter was first described as V. priceana Pollard and was recognized first as a species, then as a variety under V. papilionacea, and more recently by Cooperrider (1984) as a form under V. sororia. The new combination for V. priceana under V. communis is published in the account for f. priceana. The two floral forms are indistinguishable except for corolla color pattern and flower size (f. priceana is typically a bit larger, perhaps a pleiotropic effect of the partial albinism) but are commonly found growing together." You can see in this observation that both forms are intermixed.

Growing on 340 million year old novaculite along the Ouachita River, which is basically just biogenic silica formed from the "siliceous ooze" composed of trillions of bodies of radiolarians and diatoms at the bottom of an ancient ocean