Millettia sapindifolia is a synonym of Derris yunnanensis (Leguminosae: Millettieae)

Millettia and Derris are two taxonomically complicated genera of the tribe Millettieae (Leguminosae), and when only flowering material is available they are not easily distinguished from each other. A critical examination of literature and specimens as well as a field survey show that Millettia sapindifolia T. C. Chen, a Chinese species described on the basis of two flowering collections, is conspecific with Derris yunnanensis Chun & F. C. How. The two are closely similar in various characters, such as the inflorescence type, monadelphous stamens, branches with longitudinal ridges, and size, shape, number and hairiness of leaflets. Therefore, the former is here reduced to a synonym of the latter.