The inflorescence, floral structure and ontogeny, and breeding system of the relict woody species Dipteronia sinensis was investigated to understand the developmental basis for its floral Bauplan, more particularly the octandrous androecium, dimerous gynoecium and the occurring flower symmetry in comparison with Sapindaceae. The functionally unisexual flowers arise in thyrses. Structural floral dimorphism was clearly observed in the different lengths of style and filaments and in the presence or absence of fructifications. Functionally pistilla...
