herbs, rooting at nodes. Leaves opposite, simple, entire, petiolate, stipules
scarious or pellucid. Flowers solitary, subsessile in leaf axils, pentamerous,
bracts and bracteoles absent. Calyx tube cylindric, short, barely exceeding
subulate lobes. Corolla infundibular, fugacious, lobes ovate, acute. Anthers in
lower half of corolla tube, subsessile, dorsifixed. Ovary 2-locular, placentae
peltate, inserted on septum, styles bifid, branches erect, opposite to anthers.
Fruits globose, indehiscent, with persistent calyx. Seeds many, small, angular.