Chihuahua Flower
Tacitus bellus
This was once considered a Graptopetalum, but then someone who shall remain anonymous decided that the large flowers with lips around the carpels demanded its own genus. So now you know. I don’t know of any other species in this genus.
What is so different, besides the flowers, is the flatness of the rosette. Quite startling.
As is usual with crassulaceae, the aphids like the blooms.