Forget-me-not phylogenomics: Improving the resolution and taxonomy of a rapid island and mountain radiation in Aotearoa New Zealand (Myosotis; Boraginaceae)

A phylogenomic analysis of southern hemisphere forget-me-nots (Myosotis) reveals complex taxonomic and biogeographic patterns within a rapid island and mountain radiation centered in Aotearoa New Zealand. Using advanced molecular techniques—including target-capture sequencing, whole plastome genome skimming, and nuclear DNA analysis—the study achieved unprecedented resolution, with 2-3 times more taxon sampling and 80-120 times more molecular data than previous research. The findings highlight multiple evolutionary transitions in inflorescence morphology and multiple expansions across New Zealand's islands, including the North Island (Te Ika-a-Māui), South Island (Te Waipounamu), Stewart Island (Rakiura), subantarctic islands, and Australia. Despite challenges in species delimitation due to rapid radiation, this study provides critical insights for an integrative taxonomic revision of Myosotis, many of which are geographically restricted, threatened, or polyploid.

Meudt, H. M., Pearson, S. M., Ning, W., Prebble, J. M., & Tate, J. A. (2025). Forget-me-not phylogenomics: Improving the resolution and taxonomy of a rapid island and mountain radiation in Aotearoa New Zealand (Myosotis; Boraginaceae). Molecular Phylogenetics and Evolution, 204, 108250. https://doi.org/10.1016/j.ympev.2024.108250