Chamaesyce is former genus of plants in the family Euphorbiaceae, now subsumed into the genus Euphorbia as Euphorbia sect. Anisophyllum in the subgenus Chamaesyce. The section contains around 350–365 species that were formerly in the genus Chamaesyce. Plants in this section are known for their prostrate, branching habit and include probably best known for E. maculata, a temperate weed known as spotted spurge found worldwide, and E. hirta, a pantropical weed. Many of the species are known as sandmats. The section Anisophyllum is very closely related to plants like Euphorbia pulcherrima, the popular poinsettia.