Two small, evergreen, heath-like shrubs, one native of S.W. Europe, the other of eastern N. America. They have short, slender leaves mostly in whorls of three, and flowers in terminal clusters, usually but not always unisexual, with the sexes on separate plants. Their only ally in gardens is the crowberry (Empetrum) from which the coremas are distinguished by the terminal inflorescence and three-seeded berries. Propagation and cultivation the same as for heaths.