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Paphiopedilum callosum is accepted species in  the family Orchidaceae  subfamily: Cypripedioideae,  
Genus Paphiopedilum   subgenus Sigmatopetalum  subsection: Barbata 
Infraspecific taxa recognized within Paphiopedilum callosum: infraspecific taxa
This species is found in Indo-China to NW. Pen. Malaysia.
Paph. callosum Aung M Kyaw
Paph. callosum Aung M Kyaw
Paph. callosum Vuong Truong
Paph. callosum f. viridiflorum Vuong Truong
Paph. callosum Yosuke Oda
Paph. callosum var. thailandense Khunchai Chang
Paph. callosum Worranittha Koenig
Paph. callosum Manuel Lucas
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