Has some visible features in common with this one. Including a general hairiness and bearded side petals.

https://en.wikipedia.org/wiki/Viola_adunca

It does look very close, but although the description states 'hairy' none of the photos I'm coming across seem as hairy as this one, especially on the flower stems.... but then as it ranges across NA I'm sure theres some variation in form. They don't seem to clump up at all either, but since I haven't noticed them surviving too long that might be that the plants are too young.

Yeah. World domination. That's what I'm worried about. The regular violet also just showed up, and even with me grubbing out every hot spot, the virus still spreads.

I have enough creeping charlie in the lawn to keep it green when the grass dies lol

The accompanying description (at page below) says the foliage can be either smooth or have hairs on it.

Viola adunca is polymorphic with over 50 named taxa. G. D. McPherson and J. G. Packer (1974) reported that diploid, triploid, and tetraploid races of V. adunca occur in Canada and northwestern United States. They found that diploid and tetraploid chromosome races can be distinguished morphologically based on style beards and on the size of guard cells and pollen grains and recommended taxonomic recognition of both races. In diploid races, the style projections are more or less cylindrical and about one-sixth the width of the style; in tetraploid races they are short-conical or globular, and about one-tenth or less than the width of the style beard.

www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250100894

Interesting about the polyploidy, and I was figuring my form fell somewhere within one of the polymorphic forms of this violet, but of course now I've noticed that the range maps I can access all show it as a western or northern NA species. None show it as far South as Pennsylvania, but I don't think that rules anything out since it easily could have hitched a ride in on something else.

I found another 'sand violet', this one is viola fimbriatula but I can't find a range for it. Maybe I'll just call what I have a sand violet and that will be enough.

Not listed by the Flora

http://www.efloras.org/browse.aspx?flora_id=1&start_taxon_id=134607

Other sites appear to be indicating synonymy with V. sagittata (Flora description below, with link to range map). There are pictures of that one that look like yours.

www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=242417475

I think that's it! I did come across V. sagittata but the leaf shape was wrong, but then I saw V. sagittata var. ovata and that seems right. Maybe V. fimbriatula is a synonym of var. ovata and not a distinct species anymore or never was. thanks for the help.