Dudleya cymosa ssp. pumila is a succulent native and endemic to California, meaning it cannot be found growing naturally anywhere else in the world. This plant is most often found on north-facing canyon walls and roadcuts throughout the transverse ranges (a series of mountains that run east-west through CA instead of the usual north-south.) Dudleya in general have special adaptations which allow them to survive challenging environments, in this case growing in the wet but coldest part of the year and surviving a long, very hot, and very dry summer.
Even in this subspecies there are many included forms, with varying traits such as flower color, leaf farina, altitude, etc., which goes in hand with Dudleya being a genus of complicated and still-developing taxonomy with quite a lot of undescribed species. Molecular phylogeny is making this possible by sampling genetic material to determine evolutionary relationships. This process is further complicated by the fact that Dudleya is a highly poached genus and many populations of unique plants are threatened by sprawling human development and introduced herbivores before they even have a chance to be recognized.
Dudleya is one of my favorite genera of plants, so expect to see more of them in my posts in the future!