The "key" for identifying the aroid from Borneo is to investigate/study its spadix/flower. The spadix is wrap up by the spathe (petal), so you must remove the spathe to view the spadix.
Close-up shot of the spadix (flower) of Bucephalandra catherineae.
Bucephalandra sp. from Jaong.
Bucephalandra sp. from Brunei.
New species of Aridarum from Brunei.