Damnacanthus indicus

Damnacanthus indicus C.F.Gaertn., Suppl. Carp.: 18 (1805) (syn: Canthium gaertneri Steud.; Canthium indicum (C.F.Gaertn.) D.Dietr.; Carissa spinarum G.Lodd.; Bridelia spinosa DC.; Baumannia geminiflora DC.; Damnacanthus formosanus (Nakai) Koidz.; Damnacanthus lancifolius (Makino) Koidz.);
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Assam to S. China, Korea (Jeju-do), Central & S. Japan, Taiwan: Assam, Bangladesh, China South-Central, China Southeast, East Himalaya, Japan, Korea, Myanmar, Taiwan, Tibet as per POWO;
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Plant for ID West Siang Dist Arunachal – efloraofindia | Google Groups: 3 images.
Plant is recorded from West Siang Dist of Arunachal pradesh in the month of August at the elevation ranges from 1000 to 1500 m.

Looks close to Rosa sericea! Pl wait for other opinions.

Not Rosa atleast. The leaves are simple. Could be some Myrtaceae.

The first foto shows stem with big prickles. I’ve not seen prickles in any Myrtaceae.

The fruit looks like a Crataegus sp.

Crataegus does not have entire leaves and hairy branches. It is an erect tree. This one looks like s spreading shrub or liana.
Uploading my Crataegus photographs.

Daemnacanthus indicus – Rubiaceae

The corrected name is Damnacanthus indicus C.F.Gaertn.