Neriacanthus Benth.

Shrubs. Leaves opposite with entire or undulate margins. Inflorescences of terminal or axillary spikes; bracts imbricate, usually colored, conspicuous; bractlets about the same size as the deeply 5-parted calyx segments; corolla tube subcylindric, the lobes imbricate, subequal, spreading; stamens 4, included, the anthers narrow, 1-celled. Capsules short stipitate, minutely punctate, shiny, glabrous, 4-seeded; seeds flattened, suborbicular, borne on blunt-tipped retinacula.