Conservation genetics of the threatened plant species Physaria filiformis (Missouri bladderpod) reveals strong genetic structure and a possible cryptic species.

In concordance with the pattern of increasing genetic distance with increasing geographic distance, Mantel tests revealed highly significant isolation by distance in P . filiformis (P<0.001; S1 Fig ) Correspondingly, the neighbor-joining tree of pairwise genetic distance generally grouped populations according to geography ( Fig 2 ), with populations in the four main geographical areas grouping separately, with each group separated by long branches.

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