Illumina NovaSeq 6000 sequencing
Genomic DNA was extracted from herbarium samples following Latorre�et al.�CPPB 2020. Levels of DNA degradation were assessed by gel electrphoresis. If needed, DNA samples were sheared using a Covaris AFA ultrasonicator, and size-selected using SPRI beads. Paired-end Illumina libraries were generated using a protocol based on Latorre�et al.�CPPB 2020 and Todesco�et al.�Nature 2020, and that included a USER enzyme treatment.