John L. Maron, Montserrat Vilà, Riccardo Bommarco, Sarah Elmendorf, and Paul Beardsley. 2004. Rapid evolution of an invasive plant. Ecological Monographs 74:261–280.

Appendix A. Locations of seed source populations.

Location	Collection site	Range	Latitude/ Longitude	Pop. number	Garden site
Germany	Hamborg	Native	53.55/10.58	18	WA, SP, CA, SE
The Netherlands	DeSteeg	Native	52.00/6.05	17	WA, SP
England	Silwood Park	Native	51.40/-0.66	16	WA, SP
Germany	Bonn	Native	50.73/7.1	15	WA, CA
Czech Republic	Prague	Native	50.08/14.46	14	WA, SP, CA, SE
France	Neuves Maisons	Native	48.60/4.03	13	WA, SP
Switzerland	Arlesheim	Native	47.48/7.61	12	WA, SP, CA, SE
Switzerland	Adliswil	Native	47.30/8.56	11	WA, SP, CA, SE
France	Pontailler-sur-Sa�ne	Native	47.30/5.41	10	WA, SP, CA, SE
Italy	Bolzano	Native	46.51/12.15	9	WA, SP
Italy	Badia Polesine	Native	45.08/11.48	8	WA, SP
France	Clapier	Native	44.10/7.41	7	WA, SP, CA, SE
France	Assas	Native	43.70/3.88	6	WA, SP, CA, SE
Kyrgyzstan	Suu Ravine	Native	42.65/74.51	5	WA, SP
France	Cerb�re	Native	42.45/3.16	4	WA, SP, CA
Spain	Centellas	Native	41.80/2.22	3	WA, SP, CA, SE
Spain	Granera	Native	41.73/2.06	2	WA, SP, CA, SE
Spain	La Selva del Mar	Native	41.21/1.13	1	WA, SP, CA, SE
Montana	Ravalli	Introduced	47.30/113.96	18	WA, SP
Washington	Mima Mounds	Introduced	46.63/122.95	17	WA, SP, CA, SE
Oregon	Corvallis	Introduced	44.61/123.20	16	WA, SP, CA, SE
Oregon	Winchester	Introduced	43.26/123.36	15	WA, SP
Oregon	Sunny Valley	Introduced	42.70/122.88	14	WA, SP, CA, SE
Oregon	Gold Hill	Introduced	42.45/123.66	13	WA, SP
Oregon	Ashland	Introduced	42.20/122.71	12	WA, SP
California	Gasquet	Introduced	41.85/122.63	11	WA, CA, SE
California	Weed 1	Introduced	41.43/122.25	10	WA, SP
California	Weed 2	Introduced	41.33/122.38	9	WA, SP, CA
California	Mt. Shasta	Introduced	41.30/122.25	8	WA, SP
California	Eel River	Introduced	40.83/124.10	7	WA, CA, SE
California	Holiday	Introduced	40.62/122.30	6	WA, SP, CA
California	Covelo	Introduced	39.88/123.25	5	WA, SP, CA, SE
California	Sierra Field Station	Introduced	39.25/121.60	4	WA, SP, CA, SE
California	Meadow Vista	Introduced	39.00/121.08	3	WA, SP, CA, SE
California	Bass Lake	Introduced	38.66/119.50	2	WA, SP, CA, SE
California	Cazadero	Introduced	38.55/123.13	1	WA, SP, CA
Michigan	Iron Mountain	Introduced†	45.83/88.08	14	WA, SP, CA, SE
Michigan	Carney	Introduced†	45.60/87.03	13	WA, SP, CA, SE
Wisconsin	Wausaukee	Introduced†	45.45/87.63	12	WA, SP, CA, SE
Michigan	Menominee	Introduced†	45.21/87.75	11	WA, SP, CA, SE
Ontario , Canada	Rideau River	Introduced†	45.00/75.62	10	WA, SP, CA
Minnesota	Afton	Introduced†	44.90/93.06	9	WA, SP
Wisconsin	Gillett	Introduced†	44.84/88.61	8	WA, SP, CA, SE
Michigan	Kewaunee	Introduced†	44. 61/88.11	7	WA, SP, CA, SE
Wisconsin	Point Beach	Introduced†	44.26/87.56	6	WA, SP, CA, SE
Wisconsin	Green Lake	Introduced†	43.85/89.30	5	WA, SP, CA, SE
Michigan	Radrick	Introduced†	42.50/83.71	4	WA, SP
Michigan	ESGR	Introduced†	42.50/83.70	3	WA, SP, CA, SE
Wisconsin	Tecumseh	Introduced†	42.00/89.66	2	WA
Illinois	Tuscola	Introduced†	39.80/88.28	1	WA, SP

   Notes: Location refers to country (for native European populations) or state/province (for introduced North American populations) of origin. �Pop. number� is a reference number, used in Fig. 1, to indicate which population a given individual comes from. WA = Washington , CA = California , SE = Sweden , and SP = Spain.  All populations occurred below 1000 m and were separated from each other by at least 20 km. European collection sites average 3.9–16.8 cm of rainfall during May–August, the peak growing season for St. John�s Wort. For the same period, average rainfall ranges from 0.98–4.46 cm and 7.4–10.3 cm for western and central North American collection sites, respectively.

¹Introduced populations never exposed to biological control.