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Map of northwestern Europe showing the latitudinal gradient along which seeds were sampled in situ in natural Anemone nemorosa and Milium effusum populations (both circles and squares; excluding Abisko for A. nemorosa) and the common gardens (squares) where ex situ seeds were collected. Two populations per region were sampled which resulted in 14 A. nemorosa and 16 M. effusum populations.
