The Penstemon alamosensis, grown from Alplains seed last year, have wintered over nicely, and I'm looking forward to the possibility, at least, of them blooming this year. It seems that quite a large range of penstemon species is impressively hardy, growable, and even long-lived, in these dry, low humidity prairie conditions.
Here's some info on this particular species:
http://plants.usda.gov/java/profile?symbol=PEAL10
http://www.highcountrygardens.com/catalog/product/75710/
http://nmrareplants.unm.edu/rarelist_single.php?SpeciesID=129
It must be wonderful to see it in the wild!