An embryo containing four gametes is called Tetrasporic. 7 types of tetrasporic embryos.
(i) Adoxa type: Adoxa embryo has 8 nuclei. For example, Adoxa moschatellina.
(ii) Peperomia: Peperomia is a 16-nucleate embryo sac. For example – Peperomia pellucida.
(iii) Penia type: Penia is a 16-nucleate embryo sac.
(iv) Drusa: Drusa embryo contains 16 nuclei. For example – Drusa amatista.
(v) Fritilliaria type: Fritilliaria embryo has 8 nuclei. For example, Fritilliaria imperialis.
(vi) Plumbagella: Plumbagella is an embryo sac with 8 nuclei. For example – Plumbagella micrantha.
(vii) Plumbaga type: Plumbaga is a 16 nucleated embryo sac. For example – Plumbaga zeylanica.