The seven species currently placed in the genus Nashia are revised, based on the near totality of the (scant) material found in the world's herbaria. A morphological analysis of, in particular, the calyx and fruit reveals the heterogeneity of that genus. As a result, Nashia is reduced to its single original species, N. inaguensis, described from Great Inagua, Bahamas (where it is here considered to have been introduced by man), and recently found on Puerto Rico and the Virgin Islands (St Croix). Nashia spinifera, of Hispaniola, is placed in Isidroa, a monotypic new genus. The five Cuban endemics, plus two newly described here, make up the new genus Diphyllocalyx, formerly Lippia sect. Diphyllocalyx of Grisebach. The formal treatment of all nine taxa comprises synonymy, type citation, detailed descriptions, specimen citation, distribution maps, and a key for identification. Possible evolutionary scenarios as well as conservation status are discussed.

Version of record first published online on 4 January 2016 ahead of inclusion in April 2016 issue.