large blue hepatica

Hepatica transsilvanica has an evolutionary origin as a hybrid species. Molecular phylogenetics studies have confirmed that it is an allotetraploid, meaning it formed when two different parent species hybridized, and the chromosome count doubled. Its maternal parent is Hepatica nobilis, a widespread European species with entirely lobed leaves, while its paternal parent is Hepatica falconeri, a diploid species native to Central Asia with crenate (scalloped) leaves. This hybrid origin is evidenced by several lines of genetic research. Analysis of nuclear DNA sequences shows patterns consistent with contributions from both parent species, while the plant's plastid DNA (inherited maternally) closely matches that of H. nobilis. The hybrid nature is further supported by the plant's intermediate leaf morphology and its tetraploid chromosome count (n=28), compared to the diploid count (2n=14) of H. nobilis. Dating analyses suggest this hybridization event occurred about 3 million years ago, during the late Pliocene epoch. This makes H. transsilvanica substantially older than many European plant species, with its origin predating the major Quaternary glaciation cycles that reshaped much of Europe's flora.