If you’re interested in California biogeography, I invite you to read this paper.
This publication results from the fine MS thesis research of my prior student Kristen Emata. A very compelling story of an apparently old CA lineage with roots in the southern Sierra Nevada. From these roots, the genus has diversified into > 25 species and has somehow crossed the Central Valley multiple times. Similar selective pressures in Coastal versus Sierran habitats have forced convergent morphological change in distant phylogenetic relatives. A very, very cool story. And thanks again to DE for his foundational and inspirational work!