Summary
On the basis of phytogeographic evidence it is suggested that Psophocarpus tetragonolobus has an African ancestry, a possible parallel with the origin of guar (Cyamopsis tetragonoloba) is suggested. The most probable ancestral species is Ps. grandiflorus native to East Africa from Ethiopia to Zaire. This hypothesis could be tested by experimental hybridization between the cultigen and its closest wild relative Ps. grandiflorus.
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Smartt, J. Some observations on the origin and evolution of the winged bean (Psophocarpus tetragonolobus). Euphytica 29, 121–123 (1980). https://doi.org/10.1007/BF00037256
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DOI: https://doi.org/10.1007/BF00037256