Fig 2. First male flowering of eleven Ambrosia artemisiifolia populations in a reciprocal common garden experiment.

Gardens were located in Uppsala, Sweden (N 59° 48´ 55”, E 17° 38´ 47”) and in Osijek, Croatia (N 45° 31´ 16”, E 18° 40´ 54”). Mean number of days from start of common garden experiment until first male flower appearance of each population. Latitudes refer to sites from which seeds were collected (for details of populations and exact latitude information see Table 1).