Trees evergreen. Leaves opposite, 2-pinnately compound; leaflets entire. Inflorescences short racemose, borne on old stems or short lateral branches. Calyx tubular, spathelike, laterally divided, densely puberulent abaxially. Corolla tubular, orange-yellow; lobes 5, rounded, subequal, reflexed, constricted at base. Stamens 4, subequal, inserted at base of corolla tube; anthers divergent. Disc annual. Ovary long terete, 2-locular. Stigma lingular, compressed, 2-lobed. Capsule dehiscing loculicidally, linear; valves thin leathery. Seeds 2-rowed on each placenta, thin mambranous, transparent and membranous winged at both ends.

One species: S China, India, Laos, Myanmar, Vietnam.

Mayodendron is sometimes reduced to synonymy of Radermachera, a view supported by T. Santisuk.