Passiflora caerulea…do you ever feel like no matter what you do, you are gona’ lose it? Passion flowers belong to their own self named family. Okay. Good…but they belong in the same order Malpighiales, as do the Euphorbia and thus also fit into the larger group of Rosids? How? This is about the most complicated flower structure I can imagine with 5 petals and 5 very similar sepals, 5 stamen and 3 stigma with all of those floral filaments.