In this report we provide a taxonomic revision of Cyanotis (two species) and Belosynapsis (two species) in Taiwan. A new combination, Belosynapsis kawakamii, is made. We also document the rediscovery of Murdannia edulis, which has not been collected for more than half a century on this island. A taxonomic treatment as well as line drawings of all five species are provided to aid in identification. A meiotic chromosome count of n = 21 is reported for M. edulis from Taiwan for the first time.