Artemisia gilvescens, Oenothera macrocarpa and Pseudosasa japonica – new for Austria – and further contributions to the alien flora of Upper Austria and Styria Records of 16 alien vascular plant taxa are listed. New for Austria (not listed in Walter & al. 2002 and Fischer & al. 2008) are: Artemisia gilvescens, Glyceria striata subsp. difformis, Heracleum sphondylium × H. mantegazzianum, Oenothera biennis f. sulphurea, Oenothera macrocarpa, Pinus wallichiana and Pseudosasa japonica. New for Upper Austria (not mentioned in Walter & al. 2002, Fischer & al. 2008 and Hohla & al. 2009) are Aucuba japonica, Calystegia pulchra, Coix lacryma-jobi and Xanthium albinum subsp. albinum. New for the region Innviertel (Upper Austria) are Brassica juncea and Linaria supina. New for Styria (not mentioned in Walter & al. 2002 and Fischer & al. 2008) are Astilbe rubra and Limonium gmelinii. New for the Alpine region in Upper Austria (not mentioned in Hohla & al. 2009) is Cichorium calvum. All taxa are discussed in the context of floristic literature. uploaded for Neilreichia by Plazi