RESEARCH ARTICLE Open Access Complete plastid genomes from Ophioglossum

Full list of author information is available at the end of the articleConclusions: Although molecular analyses were inconsistent with respect to the position of Marattiales and Equisetales, several genomic structural changes have for the first time provided a clear placement of these lineages within the ferns. These results further demonstrate the power of using rare genomic structural changes in cases where molecular data fail to provide strong phylogenetic resolution