Muzu, the cultivated species under the genus Muzu. Based on the results of surveys and measurements of more than 11,000 copies of the Crops Research Institute for the Semi-Arid Tropics (CRISAT) resources collected from 52 countries around the world, the morphological characteristics of the cultivated species of Mucuna pruriens are briefly summarized as follows.

Roots

The root system of Mucuna pruriens consists of a deep and strong lignified primary root and well-developed lateral roots distributed in the shallow soil layer. When conditions permit, the roots can descend to below 2m, but more roots are concentrated in the soil layer of about 60cm. The growth of the root system before and after flowering is more or less equal. Wood bean root system and plant type is closely related, tall and compact varieties of the root system is longer, deeper into the soil; the root system of the diffuse varieties of the root system into the soil is shallower, lateral distribution, and more lateral roots.

Wood bean and cowpea genera of rhizobia **** born, forming rhizomes. The shape and size of mature rhizomes are highly variable, ranging from 0.2 to 2 cm in diameter, with spherical, oval, oblong or branched shapes. Most of the rhizomes are embedded in the lateral roots, located in the topsoil layer of 30cm, and smaller rhizomes are often found on the root system at a depth of 120~150cm, and even deeper roots can be found on the rhizomes. Wood bean rhizomes were formed continuously within 120d after sowing, but the rhizomes generated in the early stage also started to decline at the same time about 30d after sowing. The amount of nitrogen fixation by the rhizomes is generally 42-90 kg per hectare per season.