Primrose Family. Comprised of 58 genera and about 2,600 species. They are mostly grown as ornamentals and include annual or perennial herbs, shrubs, lianas and trees. Members of this family usually have winter storage organs, five petals joined in a tube, five stamens joined to the tube opposite the petals, calyx of five parts joined in a tube, undivided leaves, and a seed pod with one chamber forming inside the calyx.