The distribution of dandelions (Taraxacum spp.) in Higashi-Hiroshima was described and discussed in relation to the urbanization. It is concluded that two introduced dandelions, Taraxacum officinale and T. laevigatum have been extending their habitation, especially in urban areas. It seems that the native dandelion, T. japonicum lives such special regions as gardens and edges of agricultural lands, where are influenced under human management. The natural hybrids between native and introduced dandelions are frequently found in natural gardens associated with T. japonicum.