Burttianthus caulescens (old name is Aridarum caulescens) "narrow leaf form" from Bintulu

Burttianthus caulescens looks very similar to Bucephalandra except the inflorescence/flower is different.

Inflorescence of Burttianthus caulescens

Burttianthus caulescens

The inflorescence is different from Bucephalandra:

Burttianthus caulescens