Digest: Multiple factors influence mountain orchid diversity and distribution.

How have orchid species diversified in the campos rupestres, Brazil? Fiorini et al. (2023) use genomic datasets and multidisciplinary approaches, including phylogenetics and population genomics, to investigate the diversity of Bulbophyllum. They demonstrate that geographic isolation alone does not explain diversification patterns in Bulbophyllum species throughout the sky forests. Some taxa show considerable evidence of gene flow, and lineages not previously identified as closely related could present a novel source of their genetic diversity.