Hrmm... well, I'd be interesting to hear if you relocate it. This species if now in the Alpine Garden as well, would suggest it is becoming a pest in the Garden, popping up in new spots all the time.
The white flowers look like Campanulaceae, possibly Edraianthus (though it would be a single-flowered species, and a white cultivar thereof) or Wahlenbergia. I can't make out all the detail... if there are no bracts immediately beneath the flower, it may be Wahlenbergia.