Just for fun: What if I have a rare native plant in my yard, and then I sell that property and move to the next county over where the species wasn’t previously known (or was it?), but I inadvertently carried some seeds on my shoe, and it got established in my new yard one county away, but then I decided to move back to my old home, by which time the new owner had stripped the yard of all native vegetation, so I grab some seeds of the transplanted plants in that second home and bring them back and plant them in the first yard, but then we have a big winter freeze that wipes out the newly reseeded plants, but the species shows up the next spring from seeds in the ground of unknown origin. What are they considered? ;-)
Just kidding!!