Abstract:The anomalous secondary growth of roots is similar to the stem in Gnetum montanum. It grows thicker through the unceasing formation of new vascular bundles by the pareuchyma cells located around the periphery vascular bundles. In the process of growth, these new vascular bundles also form vascular cells arranged in circles around the original periphery vascular bundles. The only difference between the anomalous secondary growth in shoots and roots is that in roots it is uneven, and there are no extraordinary new anomalous vascular bundles found toward outside the broad medullary rays of the primary xylem. Therefore, the roots mainly extend in the direction in which they are perpendicular to the two broad rays, and are oblate in appearance.