Paphiopedilum bullenianum PFITZER
Section: Barbata
The individual “species” from the Paph. bullenianum group are difficult to survey and are rarely assigned "correctly". The differing views of taxonomists add to the confusion, as some species are considered merely varieties or even synonyms.
An assignment can often only be made via the geographical origin.
A very good source of information for these species is the American magazine "Orchid Digest". Dr. Fowliei, James Asher, Lance Birk and others, with the support of Ray Rands (a formerly successful stockbroker who then devoted himself entirely to his passion for Paph.), visited the natural habitats of the individual species and then presented them to an interested audience in the Orchid Digest.
A good classification of the individual species can be found here:
http://www.orchidando.net/pages/21h3.htm
The following plants are therefore presented individually under species:
Paph. amabile
Paph. amboinensis
Paph: bundtii
Paph. ceramensis
Paph. celebesensis
Paph. johorensis
Paph. linii
Paph. tortipetalum
Paph. bullenianum
Occurrence: Sarawak (Malaysia, Borneo)
This species is relatively easy to recognize by the red underside of the leaf: