Three endemic species of the genus Chenopodiastrum occur on remote Atlantic islands: C. coronopus on the Canary Islands (El Hierro, Gran Canaria, La Palma and Tenerife), C. helenense (Aellen) Uotila, comb. nova on Saint Helena, and C. selvagense Uotila, sp. nova on the Selvagens Islands (Selvagem Grande and Selvagem Pequena) and the Desertas Islands (Ilhéu Chão). The closest relative to all of them is widespread C. murale, which is more or less common on many Atlantic islands. Variation in C. murale is discussed, morphological descriptions of all the species are given, and their chorological histories on the Atlantic islands are discussed.