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Influences of plant density (low, mid, high) on (A) mean (± s.e.) number of pollen grains on stigmas and (B) multi-locus outcrossing rate (t ± s.e.) for 2005 and 2006 in experimental field arrays of Ambrosia artemisiifolia. Letters indicate the outcomes of Dunn–Šidák multiple comparisons. See text for statistical details.
