Over the last 200 years or so, nearly as many alien plants have been recorded in Ireland as there are native taxa. This catalogue, published in 2002, is the first annotated check-list of the approximately 920 alien plant taxa recorded in Ireland.

Catalogue entries include comments on frequency of plants, whether they are established or not, habitats where found, possible means of introduction, historical records and vice-county distribution. The catalogue also includes an historical overview and description of the current alien flora – some 645 taxa recorded between 1987 and 2001.

Copies of the catalogue are available from the National Botanic Gardens visitor centre.