Fly orchid flower. Close-up of a flower of the fly orchid (Ophrys insectifera). The flower has evolved to mimic a female flying insect and attract the male to land on the flower. In this way the pollen from the male part of the flower is spread between these European orchids, allowing them to reproduce. The orchids (Orchidaceae) are one of the most diverse families of flowering plants. There are over 20,000 species worldwide.