Meiosis, the process of cell division that produces gametes (sex cells), occurs in the reproductive organs of the lily plant. Here's where you can find it:

* Anther: The anther is the part of the stamen (male reproductive organ) where pollen grains are produced. Meiosis takes place within the pollen mother cells inside the anther, leading to the formation of haploid pollen grains.

* Ovary: The ovary is the part of the pistil (female reproductive organ) that contains ovules. Meiosis happens within the ovule mother cells, resulting in the formation of haploid egg cells.

In summary:

* Male: Meiosis in the anther produces pollen grains.

* Female: Meiosis in the ovary produces egg cells.