Sanboken

Sanboken (Citrus sulcata Takahashi, ja:サンボウカン or 'Sanbokan', ) is a Japanese citrus fruit of the Wakayama prefecture similar to a mandarin orange, easily distinguished by its pronounced basal nipple.

Parentage is unknown. Fruit is moderately juicy and of a good flavor. 'Sanboken' is late ripening. Its juice is a blend of sweet orange and grapefruit, also it has thick peel.