...are the names of two web sites that I'm looking at right now.
Christmas Holly is one of the common names for Heteromeles arbutifolia, also known as Toyon. It's a native shrub that has distinctive red berries and it's said to have been the "holly" in Hollywood.
Christmas Holly 101
Living Wild is a wiki that focuses on food, medicine, and landscape plants native to the Sierra.
Thanks to the Gardening with Natives email list for the links.