Corema D. Don.
A genus of 2 species, shrubs, one of ne. North America and one of Spain and the Azores. Li et al. (2002) showed complicated relationships between Ceratiola and the two species of Corema, suggesting the possibility that Corema conradii may have an origin as a hybrid between ancestors of Ceratiola ericoides and Corema album (of Spain and the Azores).