in botany: A genus of plants belonging to the class of tetrandria, the order of tetragynia, and in the natural system ranging under the 13th order, Succulenta. The calyx has three or four divisions; the petals are three or four, and equal; the capsules three or four, and polyperforous. There are four species; of which one only, the mucosa, is a native of England, and is not mentioned among the Scotch plants.

The mucosa, or procumbent tilloea, has prostrate stems, almost almost erect, generally red, and grow longer after flowering. The parts of fructification are always three. The leaves grow in pairs, and are fleshy. It is found on dry heaths in Norfolk and Suffolk, and flowers in May and June.