The development of male and female flowers in the Pistacia vera tree was studied using a powerful microscope. Both types of flowers start growing in a similar way, with stamen and carpel parts forming in both. However, as they grow, male flowers end up with functional stamens, while female flowers have a gynoecium with one working carpel and two non-functional ones. This difference becomes clear early on, as the opposite sex's organs stop growing at an early stage. Male flowers end up with 4-6 stamens, while female flowers have one working carpel.