in botany: A genus of the monogynia order, belonging to the tetrandria clas of plants; and in the natural method ranking under the 47th order, Stellate. The calyx is small, quadridentate; the corolla monopetalous, long, and funnel-shaped. The two seeds are naked, and crowned with the calyx. There are three species, viz. 1. Arvensis; 2. Muralis; 3. Fruticosa.