Concept:Leguminous forages are plants belonging to the legume family, while grasses are not legumes.Explanation:Centrosema pubescens, Stylosanthes gracilis, and Calopogonium mucunoides are all leguminous forage crops.Panicum maximum, commonly known as guinea grass, is a grass and not a legume.Hence, it is the only plant in the list that is not a leguminous forage.Answer:B. Panicum maximum