Description from Flora of China
Echites sect. Aganosma Blume, Bijdr. 1040. 1826; Amphineurion (A. de Candolle) Pichon.
Lianas woody, with white latex. Leaves opposite, interpetiolar line evident. Cymes terminal or axillary, corymblike; bracts and bracteoles sepal-like. Flowers large. Calyx divided halfway or deeper, with 5 or more basal glands inside, sepals usually longer than corolla tube. Corolla white, salverform; tube long cylindric, widened at base; lobes overlapping to right. Stamens inserted at lower third of tube; anthers included, sagittate, adherent to pistil head, cells with a rigid, empty basal tail; disc ringlike or tubular, lobed or dentate, surrounding ovary. Ovaries 2, distinct; ovules numerous. Style short; pistil head conical, apex 2cleft. Follicles linear, terete. Seeds flat, not beaked, coma early deciduous.
About 12 species: tropical and subtropical Asia, five species in China.