Wikipedia
Didiereaceae
The Didiereaceae are a small family of just four genera and 11 species of flowering plants endemic to south and southwest Madagascar, where they form an important component of the Madagascar spiny forests.
Molecular studies have shown the genus Portulacaria (previously in Portulacaceae) is part of this family, thus extending its distribution beyond the island of Madagascar. In addition, phylogenetic studies have shown that the genus Ceraria is located within Portulacaria genus, and therefore extends both genus and family still further.