A number of species and varieties are mentioned as new to the adventitious flora of the Netherlands, viz. Zingeria trichopoda (Boiss.) P. Smirn.; Poa trivialis L. var. silvicola (Guss.) Hack.; Galium floribundum Sibth. & Sm., G. murale All.; Lallemantia iberica (Bieb.) Fisch. & Mey.; Veronica cf. grisebachii Walters; Ricinus communis L. var. brasiliensis Müll. Arg., id. var. armatus (Andr.) Müll. Arg., id. var. rugosus Müll. Arg.