A new species of Apatophyllum (Celastraceae) endemic to the Austin Botanical District of the Eremaean Botanical Province of Western Australia, namely A. macgillivrayi Cranfield & Lander, is described. A key to species of Apatophyllum and a map of their distribution is provided. The differences between Apatophyllum and the putatively related genus Psammomoya are briefly noted.