From the Sierra Nevada of California and Nevada we have Penstemon newberryi ssp. newberryi. This is a high elevation Penstemon. I find it growing on loose decomposed granite screes at 4,300-11,500 foot (1300-3500 meters) elevations. On these loose screes, the movement of the loose material will, over time cover the stems were they sprawl, these stems will root easily. The resulting mats can be several feet across. This also makes it a snap, to take rooted cuttings.One of the joys in finding a stand in bloom comes from watching the little Black Chinned Hummingbirds, preform aerial acrobatic moves, while chasing off would be interlopers. Chirping and buzzing threats the whole time.
Again look for seed on the exchange!! :)