However, wild material may be identified unequivocally by the generally smaller leaf size, the increased hairiness of leaves and legumes, the smaller and often elongated and irregular shape of the tuberous root, and the dark brown colour of the tuber surface. The legumes of both wild and cultivated genotypes are dehiscent, as the crop has never been selected for grain legume characteristics, i.e. seed producers harvest the legumes when not quite mature.