Passion flower is one of the best flower in the world. Here is a high resolution picture of the flower of Passion in close up. This flower also known as Passiflora. The passion flowers have a unique structure, which in most cases requires a large bee to effectively pollinate. The leaves are used as food plants by the larva of a number of lepidoptera. The “Passion” in “passion flower” refers to the passion of Jesus in Christian theology. Spanish Christian missionaries adopted the unique physical structures of this plant, particularly the numbers of its various flower parts.