This is the fourth of a series of miscellaneous contributions, by various authors, where hitherto unpublished data relevant to the Euro Med (or Sisyphus) Project are presented. This instalment deals with the families Chenopodiaceae, Compositae, Orobanchaceae and Gramineae, including new country and area records for taxa of Allagopappus, Anacyclus, Andryala, Aristida, Avena, Brachypodium, Cenchrus, Cladanthus, Digitaria, Eragrostis, Helichrysum, Megathyrsus, Panicum, Pennisetum, Pulicaria, Salicornia, Schizogyne, Senecio, Taraxacum and Triticum, and the validation of names in the genera Andryala, Elymus, Hieracium, Koeleria, Neoschischkinia, Orobanche, Pilosella, Secale and Senecio.