Ryūkyō Koume

Prunus Mume
Japanese Apricot
Ume

Ryūkyō Koume
竜峡小梅（りゅうきょうこうめ）
'Ryūkyō Koume ' is typically grown for fruit,  but will produce enjoyable flowers, and can also be used for bonsai.  This cultivar was discovered in the Taishō era (1912-1926) in Matsukawa, Nagano prefecture.  The 'ko' prefix refers to this cultivars relatively small fruit (~2-5g) that have a high volume of flesh despite their size.

Primary uses
Known for its particularly nice firm texture when used in Umeboshi