Abstract
1. The megaspore mother cell of Nymphoides peltatum protrudes from the ovule and there is no tapetal cell. 2. The result of reduction division is a spherical tetrad in the ovule. 3. The embryo sac is not surrounded by a nucellus but lies next to the integument. 4. There is an integumentary tapetum. 5. The embryo sac is the normal type of eight nuclei. 6. The antipodals are ephemeral. 7. The pollen tube enters the ovule through the micropyle. 8. The endosperm is cellular and there is no free nuclear division. 9. The fertilized egg does not divide until the endosperm has filled the embryo sac. 10. The embryo has an ephemeral one-celled suspensor. 11. The mature seed contains a dicotyledonous embryo imbedded in an endosperm.
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