A botanist Strange-Tripper was excited to hear rumours of this Ranunculus sulphureous being spotted in Montana's Beartooth Mountains. Excited enough to climb to 11,000 feet to verify the sighting. As you can see here, it is normally found only in the far northern arctic reaches.
I asked him if perhaps birds were responsible. He looked at me like I was the class clown, sighed, and said that no, it was probably an isolated vestigial population, a remnant of the last Ice Age as it were. I still like the bird idea better.