Chromosome numbers in Boykinia and allies (Saxifragaceae)

Chromosome numbers are reported for the first time for Boykinia intermedia (2n = 14), B. major (2n = 28), Peltoboykinia watanabei (2n = 22), and Suksdorfia (= Hemieva) ranunculifolia (2n = 14). Additional counts are provided for eight other species of Boykinia (including Telesonix), Peltoboykinia, Suksdorfia, and Bolandra. Previous literature reports are reviewed and some errors pointed out. Chromosome numbers do little to resolve the problem of generic limits, with the exception of supporting the segregation of Peltoboykinia. They do, however, support the recognition of Boykinia intermedia as a species distinct from B. major.