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Update-this orchid has grown a lot over the last 3 years and mature plants will have upwards of 60 flowers per inflorescence. They are pollinated by a small brownish-bronzy colored bee, not the typical metallic green ones that pollinate many of the orchids here.
Gilma, if you have only a single passion fruit plant it will rarely if ever produce fruit. It needs a second plant nearby for cross pollination. I had the same problem till I planted a few seeds in new spot and now they produce a fair amount of fruit. Though I've heard some people need to hand pollinate the flowers anyways due to lack of pollinating bees.
Here in Northern Costa Rica they have been passing through for a couple weeks already. They seem to be migrating north. This year there are quite a few. Most years they are pretty rare here. Hard to get a picture though as they never seem to stop.