There are over 60 true species with edible fruits - promising interspecific hybrids also exist.
NewCROP has Passion Fruit information at:
Passionfruit Julia Morton, Fruits of Warm Climates
Golden Berry, Passionfruit, and White Sapote: Potential Fruits for Cool Subtropical AreasRichard McCain
Tropical FruitsMary Lamberts and Jonathan H. Crane
MaypopSievers, A.F. 1930. The Herb Hunters Guide. Misc. Publ. No. 77. USDA, Washington DC.
Magness J.R. et al. 1971. Food and feed crops of the United States.
Herbs Affecting the Central Nervous SystemVarro E. Tyler
Outside links:
Passionfruit can be found in Lost Crops of the Incas from National Academy Press
Curuba Passiflora mollissima
Sweet Grandilla Passiflora ligularis
Columbian Passionfruit Passiflora antioquiensis
Curubejo Passiflora popenovii
Galupa Passiflora pinnatistipula
Chulupa Passiflora maliformis
Rosy Passionfruit Passiflora cumbalensis
Passiflora schlimiana
Passiflora ampullacea
Passiflora tripartita
Passiflora mixta
Passiflora ambigua
Passiflora mandonii
Passion Fruit "FRUIT FACTS" (Fruit Facts are a series of publications of the the California Rare Fruit Growers, Inc. that contain information on individual fruits, including botanical identification, description and culture notes based on California research, and characteristics of cultivars).
Ethnobotanical and phytochemical information on Passiflora spp.
The Passiflora Discussion Group:
Send an email message to BIHOREL@cris.com, put the word PASSIF in the subject line, in the message portion of the letter, put the word SUBSCRIBE your name.