Have a look through the below!
Bucces are very similar so quite hard to identify!
http://ukaps.org/forum/threads/bucephalandra-all-in-one.26970/
hoggie
I also read one paper published in 2014 by Wong and Boyce.
This one?
http://www.aroid.org/gallery/boyce/Schismatoglottideae of Borneo XXX – Bucephalandra - [Willdenowia 44, DOI httpdx.doi.org10.3372wi.44.44201] - Wong & Boyce 2014.pdf
(Edited) .. The chances are high it's a Sekadau also oftenly offered with the name Green wavy..