Glabrous or mealy lianes with milky latex. Lvs opposite, entire. Fls few, in pedunculate axillary cymes. Calyx large and foliose, divided to near base, eglandular. Corolla slightly contorted in bud, usually campanulate, sometimes salverform, 5-lobed; tube inflated at base; lobes somewhat erect at first. Corona attached to corolla tube, of 5 ovate or ligulate scales appressed to the staminal tube. Filaments united in a short tube; anthers terminated by a small incurved membrane. Follicles leathery, smooth, sometimes inflated.