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Appendix A: Origin and description of Centaurea stoebe populations used in the feeding bioassays.
Ecological Archives E092-071-A1.

Appendix B: Taxonomy and origin of the North American (NA) and European (EU) generalist herbivores.
Ecological Archives E092-071-A2.

Appendix C: Relative growth rate (means ± SE) of European and North American generalist herbivores fed European tetraploid (C. stoebe), North American tetraploid (C. stoebe), or control plants.
Ecological Archives E092-071-A3.

Appendix D: Relative growth rate of Trichoplusia ni.
Ecological Archives E092-071-A4.

Appendix E: Relative growth rate of Heliothis virescens.
Ecological Archives E092-071-A5.