in botany: A genus of plants belonging to the class of dianthus, and order of gynoecium; and in the natural system ranging under the 13th order, Succulentes. The calyx is quinquepartite; the corolla pentapetalous, and inserted into the calyx; the petals are entire; the capsule is unilocular and bivalve, the one valve being less than the other. There are two species, the cordifolia and triflora.