The term SEED OF A LEGUMINOUS PLANT can be broken down into two crossword solutions: PEA (3 letters) and BEAN (4 letters). Legumes are a type of plant that produce seeds in pods, such as peas, beans, lentils, and peanuts. Peas and beans are two of the most common legumes, and their seeds are used for food and animal feed. Peas are small, round, and green, while beans are larger and come in a variety of colors.