Most of the purple flowered
"Dragon Fruit" grown in Southern California is Connie Mayer.
Connie Mayer is the creation of an epiphyllum hybridizer named Eckhard Meier.
Connie Mayer has a pretty flower, but small and not the best tasting fruit.
More recently we are seeing Edgar Valdivia's purple flower Dragon Fruit hybrid he calls
Asunta 4.
https://www.youtube.com/watch?v=LZXovx-157s&Connie Mayer and Asunta flowers look the same.