In September 2012, I wrote about our Passion Flower vine (Passiflora caerulea 'Blue Crown'). I referenced the Agraulis vanillae (Gulf fritillary) butterfly, which has no native host in California and is entirely dependent on the genus Passiflora.  Last year we had 4 butterflies.  This year we already have 8, and more are on the way.  It is awesomely- exciting to discover multiple pupa/cocoons and caterpillars. Here are several photos as well as the fritillary mating on Borage (Borago officinalis).    

As I wrote in September, Art Shapiro (butterfly expert and professor of ecology and evolution at UC Davis), says the Gulf frit was first recorded in the Bay Area before 1908 and became "established" here in the 1950s.  http://butterfly.ucdavis.edu/node/448