| Summary: | Includes bibliography. === This study arose from difficulties encountered in identifying Psoralea s.l. for the Flora of southern Africa. A worldwide assessment of the genus Psoralea resulted in the fragmentation of the genus into six genera: Bituminaria, Cullen, Hallia, Otholobium, Orbexilum, and Psoralea. In the course of this study a detailed comparison was made of the tribes Psoraleeae and Amorpheae. Considerable new data from phytochemistry, palynology, morphology and leaflet anatomy confirmed that they were distinct and not closely related as had been widely assumed: new characters included cotyledon type, arrangement of the embryo and radicle in the seed, seed shape, fruit morphology, chromosome numbers, petiolar anatomy, root architecture, nodule type, inflorescence architecture, 6AH-pterocarpan and 6a-hydroxy analogue chemistry, pollen anatomy and morphology. A cladistic analysis was made of the genera in the Psoraleeae.
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