Description from Flora of China
Fernandia Baillon; HaplophragmaDop.
Trees. Leaves 1-pinnately compound; leaflets 2-5(or 6) pairs. Inflorescences cymose, terminal or axillary, pubescent. Calyx tubular or campanulate, usually 2-5-lobed, subzygomorphic or regular, persistent. Corolla funnelform or campanulate; lobes 5, subrounded, sinuate or crenate. Stamens 4, didynamous; anthers 2-celled, slightly divergent, included; staminodes small. Disc annular, occasionally dentate. Ovary terete, glabrous or pubescent, 2-locular; ovules numerous, in 2 rows. Capsule dehiscing loculicidally, 4-angular; valves thin leathery; septum thick, smooth, vertical with fruiting valve. Seeds in 2 rows, numerous, nearly square, narrowly membranous winged at both ends.
About 14 species: four in tropical Africa, three in Madagascar, six in SE Asia (Bangladesh, Cambodia, India, Indonesia, Laos, Malaysia, Myanmar, Thailand, Vietnam); one species in China.