| Time after Pollination | Ovary and Megagametophyte | Microgametophyte |
| unpollinated | inner carpel walls appressed to each other, meristematic protuberances present but quiescent | mature, 2-celled pollen grains contained in the pollinia |
| 2 days | hair cell growth from inner ovary epidermis begins, cell division begins | pollen hydrated |
| 4 days | protuberances develop | pollen begind to germinate, vacuoles visible in pollen grains |
| 1 week | placentae (carpels?) separate | vegatative and generative nucleii move into pollen tubes |
| 2 weeks | hair cells fill ovary locule, first branching of meristematic protuberances | pollen tubes enter ovary (10 days) |
| 4 weeks | further branching of meristematic protuberances | many pollen tubes in ovary |
| 5 weeks | ovule primordia obvious, but no long file of cells inside and no archesporial cell | |
| 6 weeks | archesporial cell present. ovule primordia begin to bend | pollen tubes reach ovary bottom |
| 6-7 weeks | integuments are initiated, outer first at bend in ovule | |
| 7 weeks | further development of the integuments | pollen tubes change direction of growth to reorient towards ovules. Growth along inner epidermis |
| 8 weeks | megaspore mother cell formed, suspended in early prophase. Inner integument halfway up m.m.c. | |
| 10 weeks | inner integuments sealed and outer integuments almost equal in length. Nucellar cells compressed. Meiosis begins. | generative cell divides to form two sperm cells (9-10 weeks), pollen tubes at ovule area |
| 11 weeks | Meiosis continues and finishes, outer integuments reach fully extended length | pollen tubes in between ovules |
| 12 weeks | 2-nucleate to mature embryo sac (11-13 weeks population of ovules is undergoing megaspore to mature embryo sac development) | as embryo sacs mature, they are fertilized by pollen tubes |
| 14 weeks | mature embryo sacs or fertilized embryo sacs with 2-celled embryos only |