In my long-standing efforts to assemble enough photographic material to create a presentation on endemic plant species of the Pacific Northwest of North America, I managed to do the "two birds, one stone" thing when I photographed this species yesterday. I hadn't realized that Rafinesque was the author of the name Phemeranthus, so I'll also be able to use the images for my November talk entitled "Constantine Rafinesque: The Controversial Titan of American Natural History".
Mount Savona Provincial Park is purportedly the highest-elevation site in British Columbia known for Phemeranthus sediformis at about 1500m (5000ft), but I note the Flora of North America entry lists Phemeranthus sediformis occurring at 1000-2000m, so perhaps there are higher-elevation sites in neighbouring Washington or I have old information. Fameflower or Okanogan fameflower or Okanogan talinum is known only from southern interior British Columbia (E-Flora BC uses a synonym, Talinum sediforme -- and I note that I could also add these to my presentation on that topic as well) and two counties in Washington. Of particular interest is that all of its known localities were subject to glaciation.
Also of note is that this species was described and first published in 1933 by the German botanist Karl von Poellnitz, apparently from a specimen that was collected in 1851 by John Jeffrey.