Paphiopedilum amabile
Section Barbata
Synonym: Paph. bullenianum var. amabile
Occurrence: K'lamm Mountains near Sintang, West Kalimantan (Indonesia)
If you are interested, you can read more here:
http://archive.org/stream/berpaphiopedilu00hallgoog#page/n7/mode/2up
Occasionally Paph. amabile from Cambodia - but these have a heart-shaped staminodium and are therefore Paph. assigned to cerveranum.
The following pictures were made available to me by Anke Klusen:
Paph. amabile was rarely offered in Europe and is therefore hardly known, here are a few pictures from Orchid Dgest magazine (with permission)