Euphorbia antiquorum, known as antique spurge and "Euphorbia of the Ancients", is a species of succulent plant in the Euphorbiaceae family. It is the type species, and is closely related to the poinsettia−Euphorbia pulcherrima, native to Mexico. The juice of this plant is a potent ingredent for a mixture of wall plaster, according to the Samarāṅgaṇa Sūtradhāra, which is a Sanskrit treatise dealing with Śilpaśāstra (Hindu science of art and construction).