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. 2012 Jul 5;7(7):e39988. doi: 10.1371/journal.pone.0039988

Figure 5. Serpentine outcrop covered by open pine forest near Borovsko, central Czech Republic.

Figure 5

(A.) This locality probably served as a Holocene refugium for several rare plant taxa. Morphologically distinct ‘relict diploid’ cytotype of Knautia arvensis (B, population P02 in this study) also occurs at this site.