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Variability of the essential oil of Viola etrusca
Viola etrusca Erben is endemic to Italy. The essential oils obtained from different populations have been analysed to verify the phenotypic discontinuity observed in a previous study. Multivariate analysis showed differences, notably between northern and southern populations. Flamini et al. (pp. 493-497) suggest that this species could be undergoing a slow schizogenetic differentiation process due to its genetic isolation.
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