Appendix 1

Test species and populations used for host range testing. Populations/individuals originated from seeds or from plants collected in the field. The code “(BG)” indicates that seeds were donated by a botanical garden. Abbreviations are used in figures.

Used in No-Choice Experiment / Used in Cage Setup
Species / Abbreviation / Populations from field collections (Switzerland) / Populations germinated from seed1, 2 / Populations collected from field* or germinated from seed
J. abrotanifolia (L.) Moench / abr / 1 Engadine / 1 Engadine*
J. adonidifolia (Loisel.) Pelser & Veldkamp / adon / 1 Loiselle (F)
2 unknown / ------
J. alpina (L.) Moench / alp / 1 Linz, (AU)
2 Halle (BG) (D) / 1 Leiden (BG) (NL)
2 Leiden (BG) (NL)
3 Huttenberg (AU)
J. analoga (DC.) Veldkamp / ana / 1 Pakistan
2 unknown / ------
J. aquatica (Hill) P.Gaertn., B.Mey. & Scherb. / aq / 1 France
2 Darmstadt (D) / 1 France
2 Darmstadt (D)
J. erucifolia (L.) P.Gaertn., B.Mey. & Scherb. / eru / 1 Delémont / 1 Duisburg (D)
2 Oberscheden (NL)
3 unknown / 1 Delémont (CH)*
J. incana (L.) Veldkamp / inc / 1 Engadine / ------
J. maritima (L.) Pelser & Meijden / mar / 1 Marseille (F)
2 Rome (I)
3 unknown
4 unknown / 1 Marseille (F)
2 unknown
J. paludosa (L.) P.Gaertn., B.Mey. & Scherb. / pal / 1 Bern / ------
J. subalpina (W.D.J.Koch) Pelser & Veldkamp / sub / 1 Leiden (BG) (NL)
2 Salzburg (AU)
3 Huttenberg (AU) / ------
J. vulgaris Gaertn. / vul / 1 Leipzig (D)
2 Caen (BG) (F)
3 Mettembert (CH) / 1 Leipzig (D)
2 Caen (BG) (F)
3 Mettembert (CH)
P. paupercula (Michx.) Á.Löve & D.Löve / paup / 1 North America / 1 North America
S. doronicum (L.) L. / dor / 1 Bernese
Oberland,
2 Engadine / ------
S. inaequidens DC. / inae / 1 Pratteln / 1 Switzerland
2 Brandenburg (D)
3 Southern France / 1 Switzerland
S. nemorensis L. / nem / 1 Delémont / ------
S. squalidus L. ssp. rupestris (Waldst. & Kit.) Greuter
/
squa
/ Engadine / ------
S. sylvaticus L.
/
syl
/ 1 Pratteln / ------
C. officinale L. / off / 1 Delémont / ------

1D = Germany, NL = The Netherlands, F = France, CH = Switzerland, I = Italy, AU = Austria

2Unknown: seeds were derived from seed collections at Leiden University of unknown origin