Paphiopedilum vejvarutianum was described by Gruß and Röllke in 2003. There are several photos at Dr. Tanaka's web site. Dr. Tanaka's site mentions that the species occurs at the elevation of 500-750m, near the Vajiralongkorn Dam (formerly the Khao Laem Dam) in Thong Pha Phum District, which is a part of Kanchanaburi Province in Central Thailand. Dr. Tanaka commented that although it was described fairly recently, the species was traded as P. charlesworthii var. kanchanaburi since late 1970's.
In Paphiopedilum 2nd. edition, Braem, Chiron, and Öhlund (2014) considered that the original description is inconclusive and they questioned the validity of this taxon. They included this as a synonym of P. barbigerum. To me, the plant seems to be bigger than P. barbigerum, but I don't know the extent of intraspecific variation in plant size within P. barbigerum. But the taxonomy of this species complex seems to be pretty complicated.
I purchased mine from Andy's Orchids. The flower is a bit wacked (asymmetric) this time.
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