Limber pine (Pinus flexilis) is actually becoming somewhat popular in the Boise area. I do not know a lot about the species except that it grows more slowly than the western white pine (P. monticola) that it resembles to an extent. I am guessing that it may be more tolerant of heat than the Idaho state tree as well, possibly contributing to its popularity here. Home Depots around here actually sells a cultivar called "Foxtail Pine". I don't remember the varietal epithet, but it is a P. flexilis.

P. flexilis, to my memory, is also native to the SE mountains and the Owyhees. It from what I understand (I have never been up in the Owyhees, except on US 95 to Reno) is the main pine in the Owyhees, growing above the juniper/chaparral zone.