Abstract
According to Roberts (62) about 20 species of grain legumes are used in appreciable quantities in the human diet. These grain legumes are excellent sources of dietary protein and are expected to play a vital role in meeting the food needs of future generations of man. The top six grain legume crops in terms of production are the soybean, peanut, dry bean, chickpea, pigeon pea, and cowpea. In addition to the major grain legumes there are numerous minor grain legumes which have thus far received scant attention from the scientific community. Among these minor grain legumes is Psophocarpus tetragonolobus (L.) DC, or the winged bean. This paper will attempt to present the evidence as to the possible origin of the winged bean and to evaluate the agricultural potential of the species by bringing together the limited ethnobotanical, historical, and agronomic literature.
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