A synopsis of the Southeast Asian genus Sarcotheca (Oxalidaceae) is presented. The number of species recognised has increased from 11 in the last revision of the genus to 15, primarily due to the elevation of Sarcotheca laxa varieties to species rank. The first validation of the basionyms for three species has been changed, as the generic name Connaropsis was not validly published in the generally cited source. A lectotype is designated for Connaropsis, and seven species names are lectotypified, two of them at the second step. Additionally, Sarcotheca laxa is confirmed as part of Thailand’s native flora.