An almost fully resolved phylogeny for the Dutch Angiosperm Flora

For several regions, ecologists and taxonomists have assembled information on phenotypes for almost all species of the megadiverse angiosperms. However, testing hypotheses on regional evolutionary and biogeographic history requires highly resolved and dated phylogenies covering the same taxa, which are often lacking at regional scales. Here, we filled this knowledge gap for one of the best-studied regional floras: the native angiosperms of the Netherlands.

We provide a molecular phylogenetic dataset and two time-calibrated trees (based on BEAST and MrBayes approaches) of the native angiosperm flora of the Netherlands, reconstructed from publicly available DNA sequences. The resulting phylogenies include 1178 species from the 2017 species list on SynBioSys NL, a national database that provides a curated checklist of native vascular plant species occurring in the Netherlands (also core to the flora of adjacent countries), and are provided in multiple formats (Newick, Nexus), along with alignments, BEAST and MrBayes input files, and metadata linking taxa to GenBank accession numbers. This dataset offers a phylogenetic framework that is based on molecular data covering more than 95% of the native species included in the checklist, reproducible and extremely well-resolved phylogeny (99.92% of nodes resolved in the maximum clade credibility tree; reflecting the absence of polytomies; 67.9% of nodes with posterior probability above 0.95 and 92.3% above 0.50) for researchers. These data will permit the signal of evolutionary history in patterns of biodiversity across the Netherlands, such as the age structure of habitat species pools or functional groups, where a focus on native species is essential. All resources are openly available via IDiv (https://doi.org/10.25829/idiv.3600-myr3t3) under a CC-BY license.