Upper left: the flowers of species of Catasetum are visited by males of euglossine bees for the aroma they emit.

Upper right: when a euglossine bee takes an aroma from a flower, pollinia are attached to some part of its body. The pollinia hold millions of pollen grains thereby guaranteeing abundant seed seed set with each pollination.

Lower right: the capsules of Catasetum contain millions of microspermous seeds, the result of an efficient pollination mechanism, and, perhaps one of the reasons that orchids are so ecologically successful and diverse in species..