Rubiaceae Week: Central Java Rubiaceae: Could you help me ID our Rubiaceae please. It is from low land in Cilacap Central Java. Thank you.

Looks like one of the Mitragyna species. Could be M.speciosa. But more details are needed (floral and foliage) for proper ID.

Looks different than Mitragyna speciosa!

Neonauclea purpurea