Indian Plums are dioecious plants, which means the male and female flowers are on different plants.
I went out over the weekend to photograph the flowers to show you. The top two photos below are male. You can see the stamens loaded with yellow pollen. The bottom two photos below are female. They have 5 pistils in the center. Interestingly, it looks like small stamens surrounding the pistils that appear to be not viable.
Another interesting characteristic about these flowers is their fragrance. The scent is described as something between watermelon rind and cat urine. There is something more to be said about that peculiarity, but I’m not sure what at the moment. It requires more research. If you have a chance to smell them, let me know what you think.