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Locations of the 14 Medicago lupulina populations used in this study. The size of each circle corresponds to the number of plants sampled from the population, and the color indicates the rhizobia. The Ensifer medicae strain used in the reciprocal inoculation experiment was obtained from the northernmost population sampled (“SEG”); the E. meliloti strain was obtained from the southernmost population (“DE”). See Table S1 for GPS coordinates
