Life History of Nymphoides peltatum

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Abstract
The megaspore mother cell protrudes from the ovule and there is no tapetal cell; a spherical tetrad is formed. The embryo sac lies next to the integument, with an integumentary tapetum; it is of normal type with 8 nuclei and with ephemeral antipodals. The pollen tube enters through the micropyle. The endosperm is cellular and there is no free nuclear division. The fertilized egg does not divide until the endosperm has filled the embryo sac. The embryo has an ephemeral 1-celled suspensor. The mature seed contains a dicotyledonous embryo imbedded in an endosperm.

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