Abstract: The systematic positions of these three genera Pyrenaria, Tutcheria and Parapyrenaria have been studied in this paper based on these data of morphology, embryology, palynology and anatomy.Morphologically, these main characters proposed by former researchers to differentiate these three genera from one another, such as the number of ovules in each locule and the texture of carpodermis, etc. are continually variable so that it is difficult to distinguish them clearly. The high similarity in the shape, structure and germination type of their seed binds them closely to-gether.

Key words: Theaceae