With some monotypic and oligotypic genera, Dodonaeoideae is a key group on the systematics of Sapindaceae. However, the taxonomical and systematical study on Dodonaeoideae is rather limited. The extant taxonomical system lacks camparative morphological data, and the taxonomical revisions are also sporadic, making this group one of the difficult subfamilies in Sapindaceae. In this study, we will comprehensively study the taxonomy and systematics of Dodonaeoideae from China based on 1) the literature survey, herbaria and field investigation; 2) floral organogenesis and embryological characterist...