I was walking down a street in Vancouver, on my way to a particular sporting goods store to purchase a particular (and expensive) pair of shoes. The store is a few blocks from a relative's home, which is where we parked the car.
My guess was these were some European elm species that for some reason had been planted along this block decades ago, and nowhere else. With this assumption, I was happily surprised to see licorice fern, a staple of BC coastal rainforests, growing from the north side of the trunks of some of the trees. These were well-integrated foreigners.