README Files deposited in Dryad are below with file descriptions. Files include whole genome assembly and annotations for Rhododendron williamsianum and pseudochromosomal files used in syntenic analyses in the study below: Soza VL et al. 2019. The Rhododendron genome and chromosomal organization provide insight into shared whole genome duplications across the heath family (Ericaceae). Genome Biol. Evol. 11:3353–3371. doi: 10.1093/gbe/evz245. Rwill.assembly.renamed.fixed042418.fasta.gz - entire genome assembly in fasta format for Rhododendron williamsianum. Rwill10.masked.pseudochromos.fasta.gz - fasta sequences for pseudochromosomes of R. williamsianum. These were generated by stitching ordered scaffolds assigned to linkage groups (LGs) together with 100-N spacers. Rwill10.pseudochromos.maker.sorted.renamed.blast.function.iprdomains.gff - gff file for gene annotations on R. williamsianum pseudochromosomes. Rwill10.repeatmasker.runner.match.sorted.gff - repeatmasker and repeatrunner annotations from Maker for the entire genome assembly of R. williamsianum. Rwill10standard2.maker.proteins.renamed.fasta - predicted protein sequences from Maker for the entire genome assembly of R. williamsianum; gene IDs not sorted. Rwill10standard2.maker.sorted.renamed.gff - gff file for gene annotations for the entire genome assembly of R. williamsianum. Rwill10standard2.maker.transcripts.renamed.fasta - predicted transcript sequences from Maker for the entire genome assembly of R. williamsianum; gene IDs not sorted. V.macrocarpon.allLGs.sorted.offset.gff3.2 - gff file for gene annotations on Vaccinium macrocarpon pseudochromosomes. These annotations were extracted from Cranberry_Gene_Models.gff at http://cyanophora.rutgers.edu/cranberry/ based on LGs identified below. V.macrocarpon.masked.pseudochromos.fasta.gz - fasta sequences for pseudochromosomes of V. macrocarpon. These were generated from anchored scaffolds within LGs from FileS2.csv in Schlautman et al 2017 and the Cranberry_masked_assembly.fa available at http://cyanophora.rutgers.edu/cranberry/ from Polashock et al. (2014), stitching scaffolds within each LG together with 100-N spacers. References: Polashock J, et al. 2014. The American cranberry: first insights into the whole genome of a species adapted to bog habitat. BMC Plant Biol. 14(1):165. Schlautman B, et al. 2017. Construction of a high-density American cranberry (Vaccinium macrocarpon Ait.) composite map using genotyping-by-sequencing for multi-pedigree linkage mapping. G3 (Bethesda) 7:1177–1189.