Do passion fruits come from passion flowers? If so, where can I find them to purchase in the San Jose/Bay Area

Answer 1

Actually, yes. Passion fruit does come from the passion flower plant. Only a few of the varieties are edible, though.
It is also called Maypop. Here's a page that will tell you how to grow and care for the passion flower plant: http://melanys.tripod.com/MayPop.htm

Oh! And I found a site that should help you locate a nursery in your area that carries it: http://userwww.sfsu.edu/~jennc005/DAI527/CaliforniaCultivar/passionfruit.htm
Happy Gardening!