Flacourtia rukam Zoll. & Moritzi, Syst. Verz. Java 33 1846. (syn: Flacourtia cataphracta Bl.; Flacourtia edulis Griff.; Flacourtia euphlebia Merrill; Flacourtia megaphylla Ridl.;  Flacourtia peninsularis Elmer ex Merr.; Flacourtia sulcata Elmer; Flacourtia sulcata Elmer);  

China (Guangdong, Guangxi, Hainan, Yunnan), Taiwan, Thailand, Vietnam, Laos,
trop. Africa (introduced), Java, Moluccas, New Guinea, Fiji (introduced),
peninsular Malaysia, Singapore, Sumatra, Borneo, Sulawesi, Philippines (Luzon,
Polillo, Mindoro, Negros, Cebu, Dinagat, Mindanao, Basilan), Lesser Sunda Isl.,
American Samoa (Manua Isl., Tutuila, Ofu, Olosega, Ta?u), Niue, Tonga
(Niuatoputapu), Western Samoa (Aleipata Islands, Upolu, Savaii), Nicobars
(Central Nicobars), India (introduced)
as per Catalogue of Life;
A native of Malaya, sometimes cultivated for the edible acidic fruits palatable by rubbing between palms as per BSI Flora of India (1993);



A plant of Purwokerto : 9 posts by 3 authors. Attachments (3)

We would like to know the name of the following tree please. 

Is it a kind of Flacourtia?

Please check for Myrtaceae trees in floras of Indonesia.

Your suggested ID seems to be correct. It could be Flacourtia inermis. Check this link. http://butterflycircle.blogspot.in/2015/10/larval-host-plant-for-butterflies.html  

I found another information: the fruit of Flacourtia innermis is sour or acidic & never been sweet, while our plant has sweet fruits and the leaves are smaller, so it is likely Flacourtia rukam

You are the best person to decide as you have access to the plant as well as the fruits. You may also check other botanical descriptions of both the species to confirm the ID.

For me it seems your ID is correct.

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