Hybridisation in Saxifraga

[linkstandalone] A recreation of a cool little graph I saw in Saxifrages of Europe [1], showing the extent of hybridisation between the subsections of the genus Saxifraga. Filled circles indicate within subsection hybridisation reported, and dashed lines are uncertian hybrid reports.

[1] Gornall, R. (1989). Saxifrages of Europe: With Notes on African, American and Some Asiatic Species. Christopher Helm.