This is the fifth of a series of miscellaneous contributions, by various authors, where hitherto unpublished data relevant to both the Med-Checklist and the Euro Med (or Sisyphus) projects are presented. This instalment deals with the families Amaranthaceae, Boraginaceae, Caryophyllaceae, Chenopodiaceae, Compositae, Convolvulaceae, Crassulaceae, Cucurbitaceae, Dipsacaceae, Euphorbiaceae, Labiatae, Leguminosae, Linaceae, Moraceae, Orobanchaceae, Portulacaceae, Valerianaceae, Violaceae; Cyperaceae and Gramineae. It includes new country and area records, taxonomic and distributional considerations for taxa in Alkanna, Amaranthus, Anchusa, Artemisia, Atocion, Bidens, Bromopsis, Bufonia, Carex, Cenchrus, Cucurbita, Cytisus, Euphorbia, Festuca, Ficus, Gnaphalium, Helictochloa, Ipomoea, Koeleria, Linum, Lolium, Orobanche, Otospermum, Oxybasis, Paspalum, Phleum, Poa, Portulaca, Stipa, Tagetes, Teucrium, Thymus, Trigonella, Valeriana and Viola, and the validation of names in Adenostyles, Aeonium, Aichryson, Cephalaria, Helichrysum, Hieracium, Jacobaea and Sixalix.