Penstemon petiolatus, Beaver Dam Wash, Utah.
A showy Penstemon that likes it hot & dry, and apparently does very well in a garden setting. It grows in southern Nevada and southwestern Utah. I would tell you where to get seed, but I want to make sure I get some first before there’s a run on it. These plants are growing out of limestone rocks punctuated with the Vishnu schist, or “basement rock” of the Grand Canyon, which is about 1.8 billion-years-old. The site was also peppered with Utah Agave (Agave utahensis), many of which were sending up flowering spikes, and barrel cacti (Ferocactus cylindraceus). I will be posting more about the wash, but in the meantime, another APS member, Andi Wolfe, posted much better pictures of these Penstemon with much more detailed information, along with great pics of the cliffs here.
This location and this Penstemon was perhaps the most popular Penstemon of the trip, for everyone. Of course, I would discover that my camera battery was dead as soon as I arrived, but someone graciously offered me their point & shoot for these. It just means I will have to return to the site again to get more pictures.