Tuber size and color of a hazelnut formed on the root of legumes herbaceous plants of the genus lathyrus ( 41 pebbles; and that the boys ate in autumn to plow the fields of Castilla y León, especially on the banks of the Pisuerga. They contain starch, minerals and fructose; some ate them like potatoes. These excrescences or nodules are formed at the root of the tuberous lathyrus, lathyrus hirsutus and lathyrus aphaca by the presence of the bacterium rhizobium leguminosarum which live in symbiosis. Legumes can fix nitrogen in the ground by what are considered fertilizers plants.
