Stamens 4, perhaps with a rudimentary fifth; filaments short, filiform, inserted near base of corolla tube; anthers short, bithecal, included.
Ovary bilocular, subglobose; style short, fleshy; stigma ovoid, capitate, cleft at apex; ovules numerous.
Calyx 5-toothed, lobes linear-lanceolate, slightly overlapping in bud.
Inflorescence cymose, axillary or terminal.
Fruit bilocular, subglobose, indehiscent.
Leaves opposite, subovate, denticulate.
Seeds numerous, ovoid, rugose.
Shrubs or coarse herbs.