Gymnopetalum Arn. is distributed from India to the Moluccas. There are 4 species, including 1 new species, G. orientale W.J. de Wilde & Duyfjes, from E Malesia. In G. integrifolium (Roxb.) Kurtz 2 new varieties, besides the type-variety, are accepted: G. integrifolium var. penicaudii (Gagnep.) W.J. de Wilde & Duyfjes (in China) and G. integrifolium var. pectinatum W.J. de Wilde & Duyfjes (in E Java). A key to the species is presented. The Malesian taxa are fully described.