Kotsubu Nanko

Prunus Mume
Japanese Apricot
Ume

Kotsubu Nanko
小粒南高（こつぶなんこう）
'Kotsubu Nanko' is typically grown for fruit,  but will produce enjoyable flowers, and can also be used for bonsai.  It is considered to be identical in taste to Nanko, despite its smaller fruit size (16-25grams) with a proportionally smaller seed.  This is a high-yield variety, and the greater the volumes of the fruit on the tree the smaller the fruit will be.

Primary uses
Umeboshi

Pollination
It can self-pollinate, but will benefit from the presence of another variety.