Table 1.
Origin of species used in the experiment
| Plant species | Origin | Dutch population used in experiment | Present since |
|---|---|---|---|
| Artemisia biennis | Eurasia | Dodewaard | 1950 |
| Artemisia vulgaris | Eurasia | Gendtse Polder | Native |
| Bidens frondosa | North America | Polder Zeevang | 1900 |
| Bidens tripartita | Eurasia | Polder Zeevang | Native |
| Senecio inaequidens | South Africa | Millingerwaard | 1925 |
| Senecio vulgaris | Eurasia | Heerlen | Native |
| Senecio jacobaea | Eurasia | Millingerwaard/Meijendel | Native |
| Solidago gigantea | North America | Gendtse Polder | 1900 |
| Solidago virgaurea | Eurasia | Seed company | Native |
| Tanacetum parthenium | Eurasia | Seed company | 1500 |
| Tanacetum vulgare | Eurasia | Seed company | Native |
| Tragopogon dubius | Eurasia | Amersfoort | 1925 |
| Tragopogon pratensis | Eurasia | Ooijpolder | Native |
Underlined species names indicate exotic species. Some exotic plants originate in Eurasia and are non-native to the Netherlands, others originate from other continents.