Bucephalandra Sp

[arjuna ireng]

hi guys, lately my brother from borneo Islan sent me some species of bucephalandra. he mentioned the place founded but i'm still confused about the international common name. please help me to identification it.

1&2 is from melawi (emersed form)
3 is from sanggau (emersed form)
4 is from sintang (half of leaf is full submerged form)
5 is from nanga pinoh (half of leaf is full submerged form)

[arjuna ireng]

here is some stalks again
please help me to identified
thanks