This is the flowers of a tree (Feijoa sellowiana) called the "pineapple guava tree". Its fruit tastes like a mixture between a pineapple and a guava. We don't eat the fruit, though, as they are always stung by fruit flies. We are quite happy with this arrangement. They don't bother us, and we don't bother them. Photo taken with my Canon 700D.
Take care.