Lactiferous, glabrous shrub, leaves whorled arranged in 3-4 rows, rarely opposite, mostly coriaceous, eglandular, with slender and narrow nerves, rarely glandular in the axil. Inflorescence a terminal paniculate cyme with large to medium sized showy flowers. Calyx lobes narrow mostly imbricate, slightly unequal with fleshy glands at the base inside. Corolla funnel-shaped with spreading, overlapping lobes, tube cylindric, short corona appendages petaloid, laciniate, opposite to the lobes. Anthers connivent with stigma. Carpels 2, free; ovules many in each ovary; style filiform or thickened above the middle; stigma fusiform. Follicles 2, vinous, more or less stout with oblong.