Thanks, both of you. If this is a first-year plant, it could be an F2 seed that some bird dropped here.
I went hunting through my notes and confirmed that I planted "hardly any" Columbines going back to 2011.
I finally found a note that I HAD sown a NO ID " Dk Blue/Purple " Columbine from Deejay9 in her Round Robin. I didn't think any of them sprouted because I remember seeing NO purple blooms there.
If that is what they are, great! I may even cut the surviving 'McKana's Giants' so this dark purple one doesn't get cross-pollinated.
Can you propagate A. vulgaris by dividing the root ball?
That could very well be Aquilegia vulgaris, and I've emailed her to ask if this looks like anything she put in that Round Robin.
