in botany: A genus of the angiospermia order, belonging to the didynamia class of plants; the characters of which are: The calyx is a tripartite monophyllous perianthium, bell-shaped and persistent; The corolla is monopetalous and tubular; the border quinqued, expanding, and small; The stamina consist of four filaments longer than the corolla; the anther oval and incumbent; The pistillum has an ovate germen; the style the length of the stamens; the stigma two, acute; There is no pericarpium; The seed is an ovate unilocular nut, the length of the calyx.