Abstract: When the embryo is proembryo in buckwheat ( Fagopyrum escidentum Moench.), the endosperm is free nuclear. When the embryo is at late globular stage, the endosperm starts to cellularize. When the embryo is heart shaped, the "open cells" of the endosperm are formed in the middle part of the embryo sac. At the stage of torpedo shaped embryo, many layers of endosperm cells in the middle part of embryo sac can be observed. The embryo is at cotyledon - curved stage and the chalazal endosperm haustorium, a trans-fer cell, is formed. The initial anticlinal walls of endosperm come from the freely growing wall and from the cell plates.

Key words: Fagopyrum esculentum