This must have come back from its roots, but there are other seedlings around it. Is this cilantro? I'm having a d'oh moment!
It looks like cilantro. If you let it go to seed last year, you will have it coming up for years to come. How about taking a taste? That should confirm whether it is or isn't cilantro.
Pinch off a bit and smell it! You should be able to tell right away.
Me, too. I thought that was what it was from the smell, but I wasn't certain. Mmmm, I'll have to harvest it and not let it go to seed this year. I kinda forgot to harvest herbs last year (bad, bad girl). :)