Passiflora, known also as the passion flowers or passion vines, is a genus of about 500 species of flowering plants, the namesakes of the family Passifloraceae. They are mostly vines, with some being shrubs, and a few species being herbaceous.
The family Passifloraceae has a pantropical distribution. Passiflora itself is absent from Africa, where many other members of the family Passifloraceae occur. Most species are found in South America, eastern Asia, southern Asia eastward to New Guinea.
It is a vigorous, deciduous or semi-evergreen tendril vine growing to 10 m [33 ft] or more, with palmate leaves and fragrant, blue-white flowers with a prominent fringe of coronal filaments in bands of blue, white, and brown. The ovoid orange fruit, growing to 6 cm [2 in], is edible but bland.
Passiflora suberosa is a species of passion flower that is native to the Americas. Its range stretches from Florida and the Lower Rio Grande Valley of Texas in the United States south through Mexico, Central America, and the Caribbean to South America. It is commonly known as Corky-stemmed Passion Flower due to the corkiness of older stems. The fruit is not hardy and transitions from green to indigo, purple and, lastly, black as it ripens. This species is a host plant for the caterpillars of the Gulf Fritillary [Agraulis vanillae], Julia Heliconian [Dryas iulia], Mexican Silverspot [Dione moneta] and Zebra Heliconian [Heliconius charithonia].
Passiflora vitifolia is a species of Passiflora, native to southern Central America [Costa Rica, Nicaragua, Panama] and northwestern South America [Venezuela, Colombia, Ecuador, Peru]. It is a vine with cylindric stems covered in red-brown hairs when young. The leaves are serrate, three-lobed, up to 15 cm long and 18 cm broad. The lobed leaves’ resemblance to grape leaves gives this passionflower its specific epithet, “vitifolia,” meaning “grape leaves” after the Latin for grape “vitis.”
The flowers are bright red, up to 9 cm diameter. The fruit is quite sour still when it falls off the plant and can take a month to ripen to its full flavor of sour strawberries.
More photos of Passiflora vitifolia [Crimson Passion flower] taken at the Jakarta Zoo, Ragunan, Jakarta Selatan 
It is cultivated commercially in warmer, frost-free areas for its fruit and is widely grown in Argentina, Australia, Bolivia, Brazil, the Caribbean, Colombia, Costa Rica, Dominican Republic, East Africa, Ecuador, Haiti, Hawaii, India, Indonesia, Israel, Mexico, New Zealand, Panama, Peru, Portugal [Madeira], Puerto Rico, Sri Lanka, South Africa, United States [California and Florida], Venezuela and Philippines.
The passion fruit is round to oval, either yellow or dark purple at maturity, with a soft to firm, juicy interior filled with numerous seeds. The fruit is both eaten and juiced; passion fruit juice is often added to other fruit juices to enhance the aroma.
^ Flower of Passiflora edulis.
In Indonesia there are two types of passion fruit [local name is markisa), white flesh and yellow flesh. The white one is normally eaten straight as a fruit, while the yellow variety is commonly strained for its juice, which is processed to make concentrated syrup and sold in many supermarkets.
Passiflora coccinea, commonly called red passion flower or red granadilla, is a tropical, tendril-climbing, evergreen vine from South America that typically grows to 10-12’ and to 3-5’ wide and produces extremely showy scarlet red to deep red passion flowers. Hummingbirds and butterflies are attracted to the flowers.
Photo: JBP, Singapore 20100513