These plants have been popping up. They smell a little funky. I am not sure if they are native or from the russian tortoise seed mix I bought. The russian tortoises ate some.
I think it came from the broad-leaf seed mixture. I had it too when I planted that mixture. I thought it was chia, but I may be wrong. If you send the picture to Joe at carolinapetsupplycom he'll be able to tell you for sure.