Citrus unshiu is a semi-seedless and easy-peeling citrus species, also known as unshu mikan, cold hardy mandarin. It is of Chinese origin, named after Unsyu (Wenzhou), China, but introduced to the West via Japan.
Its fruit is one of the sweetest citrus varieties. It is usually seedless, and is about the size of other mandarin oranges (Citrus reticulata). Satsumas are known for their loose, leathery skin; the fruit is very easily peeled in comparison to other citrus fruits.