Taxonomic scope and phylogeny
The 337 species were distributed in 210 genera, representing 96 families in 34 orders. The majority of species (268) belonged to the Eudicots, followed by 43 Monocots, 17 Magnoliids, and 9 Gymnosperms. The families Fabaceae (mostly Acacia ; 8 species) and Fagaceae (mostlyQuercus ; 13 species) were particularly well represented, with 37 and 26 species respectively (Table S1). The resulting phylogeny had 337 tips and 311 nodes (Fig. S1). In other words, 92% of the phylogeny was resolved, and only 26 tips (8%) belonged to polytomies. These polytomies correspond to clades for which phylogenetic information remains scarce or unclear (Stevens, 2001 onwards): Begonia(Begoniaceae), Alcantarea and Encholirium (Bromeliaceae),Streptocarpus (Gesneriaceae), Arceuthobium (Santalaceae),Magnolia (Magnoliaceae), Piper (Piperaceae),Psychotria (Rubiaceae), Acacia (Fabaceae), andSorbus (Rosaceae).