The distribution of Digitaria ischaemum (Schreb.) Miihlenb., D. sanguinalis (L.)P.B., Echinochloa crus-galli (L.)P.B., Setaria glauca I (L.)P.B.and S. viridisi (L.)P.B. in the province of Zeeland is described and discussed. These species were mostly rare or absent in this region until 1950, but are now more or less common especially along some main roads where conditions seem to be optimal for these thermophylic plants. Also the distribution of Eragrostis multicaulis Steud., E. poaeoides P.B., Panicum miliaceum I -, Setaria verticillata (L.) P.B. and Sorghum halepense (L.) Pers. is given and discussed. Some aspects of the ecology of E. poaeoides are added. The author proposes to insert S. halepense in the Standardlist of the Netherlands Flora 1985 as a naturalized species.