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An evaluation of the limits and infra-generic taxonomy of the genus Boykinia and its allies is presented. In the past, Boykinia has been split into the following segregate genera: Boykinia and Telesonix (from North America) and Neoboykinia and Peltoboykinia (from Japan). The situation is complicated by other closely related genera, the limits of which also need clarification. Narrowly defined, they comprise Suksdorfia, Hemieva, Bolandra, Sullivantia and Jepsonia (all from North America) and Hieronymusia (from South America). This monograph draws on a variety of sources for information, including a morphological comparison of all taxa, using a wide range of both living and herbarium material, and observations on leaf anatomy, trichomes, pollen grains and seeds; reference is also made to our previously published work on flavonoids, chromosome numbers and breeding relationships. General ecological observations were made during field work in western North America. The results of these investigations confirm that the genera form a closely related group. Much of the evidence combines to suggest the following conclusions. Boykinia includes nine species in three sections: section Boykinia (B. aconitifolia, B. intermedia, B. lycoctonifolia, B. major, B. occidentalis and B. rotundifolia), section Renifolium (B. ruhardsonii) and section Telesonix (B. jamesii and B. heucheriformis). Peltoboykinia (P. tellimoides and P. watanabei) is recognized as a distinct genus allied to both Saxifraga and Boykinia. Suksdorfia, expanded to include Hemieva and Hieronymusia, has three species: S. violacea, S. alchemilloides and S. ranunculifolia. Bolandra is very closely related to Suksdorfia but is retained as a separate genus containing two species, B. californica and B, oregana. Sullivantia and Jepsonia are accepted as genera related to, but distinct from, Boykinia.