Trees with strictly decussate branching. Leaves petiolate, obovate or elliptic, secondary nerves prominent; domatia usually present; stipules interpetiolar, caducous, colleters inserted parallel with outer margin of stipules. Inflorescences axillary or terminal, thyrsic, +/- loose but terminal flowers subcapitate. Flowers 4(5)-merous. Calyx with short tube and triangular to rounded lobes, often with 1 or 2 colleters in sinuses. Corolla: tube trumpet-shaped; lobes valvate, +/- as long as tube, with cowl-shaped tip and a long, linear to narrowly club-shaped subapical appendage. Stamens: anthers exserted, sagittate, medifixed; filaments short, arising between bases of corolla lobes. Ovary 2-locular; placenta fleshy, pendulous, bearing many upwardly imbricate ovules; style far exserted, glabrous; stigma ovoid to spherical, undivided. Fruit an elongated capsule loculicidally dehiscent from top and slightly septicidal, with persistent calyx. Seeds with striking membranous wing narrowly triangular at apex, forked like a swallow tail at base.
Species 3, trop. Africa; sthn trop. Afr. 2, Angola.