Viola tripartita (sensu lato) split into:

• Viola tripartita (sensu stricto)
• Viola glaberrima
• Viola tenuipes

Discussion here:
https://www.inaturalist.org/flags/618842

Viola tripartita in the strict sense always has at least some compound leaves or leaves with deep lobes. It has a restricted range, mostly in the southern Appalachians.

The other two species have unlobed and undivided leaves. They are apparently nearly allopatric. See this page (or references below) for their distinguishing characters.

Split recognized by:
POWO (https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:267008-2, https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:868222-1),
Flora of the Southeastern U.S. (2023 ed.),
Harvey Ballard's website