Palynological studies on eight species of Vigna namely V. ambacensis, V. gracillis, V. racemosa, V. reticulata, V. subterranea, V. triloba, V. unguiculata and V. vexillata, was carried out. Observations from the investigation showed that the pollen grain is circular and psilate in V. reticulata, circular and echinate in V. unguiculata and V. racemosa, elliptic and monocolpate in V. ambacensis and V. vexillata, circular and polyporate in V. subterranea and circular and dicolpate in V. gracillis and V. triloba. The variation in pollen morphology showed that V. reticulata and V. subterranea can be separated from the rest of the taxa based on the shape and type of their pollen grains. Also V. unguiculata and V. racemosa, can be grouped together just as V. ambacensis and V. vexillata, V. gracillis and V. triloba based on each pair having the same shape and type of pollen grains, respectively. From this study, it is likely that the nature of pollen grains in these taxa could be an evolutionary modification often inherited to determine the mode of pollination and thereby perpetuate a particular group of plants in a given environment.
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F.N. Mbagwu and H.O. Edeoga, 2006. Palynological Studies on Some Nigerian Species of Vigna savi. Journal of Biological Sciences, 6: 1122-1125.
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