Eremaea is a genus of shrubs and small trees endemic in south-western Australia. It has an unusual distribution in that 15 of its 16 species occur on or very close to the coastal plain (Irwin and Darling Botanical Districts) and one species extends throughout much of the non-forested areas of the South West Botanical Province. The genus is a significant component of the shrub layer of several vegetation types. Eight new species, 5 subspecies, and 8 varieties are described (E. asterocarpa subsp. asterocarpa, E. asterocarpa subsp. histoclada, E. asterocarpa subsp. brachyclada, E. atala, E. hadra, E. beaufortioides var. beaufortioides, E. beaufortioides var. lachnosanthe, E. beaufortioides var. microphylla, E. blackwelliana, E. ebracteata var. ebracteata, E. ebracteata var. brachyphylla, E. x codonocarpa, E. dendroidea, E. ectadioclada, E. pauciflora var. pauciflora, E. pauciflora var. calyptra, E. pauciflora var. lonchophylla, E. x phoenicea, E. violacea subsp. violacea and E. violacea subsp. raphiophylla). Keys to and descriptions of taxa, and illustrations of most taxa are presented. An index to taxa is given on page 222.