Paphiopedilum curtisii (Rchb. f.) Pfitzer 1895
SUBGENUS Sigmatopetalum SECTION Barbata SUBSECTION Loripetalum
Var alba Photos by © Lourens Grobler. Photo courtesy of Nik Fahmi and his Vortex Orchid Page
and 
Common Name Curtis' Paphiopedilum [English Orchid Grower]
Flower Size 4 1/2" [11.2 cm]
Found in Sumatra as a medium to large sized, hot growing terrestrial with 4 to 5, elliptic to oblong-elliptic, tessellated dark and light green above leaves that are flushed purple underneath towards the leaf base that blooms in the spring and summer on a 10" [25 cm] long, single flowered inflorescence with elliptic-lancecolate floral bracts.
Often cited as a synonym of Paphiopedilum superbiens and most likely is but I have left them separate at this time.
Synonyms Cordula curtisii Rolfe 1912; *Cypripedium curtisii Rchb. f. 1883; Paphiopedilum superbiens var. curtisii (Rchb.f.) Braem 1988
References W3 Tropicos, Kew Monocot list IPNI ; Die Orchideen Schlechter 1915; Atlas des Orchidees Cultivees Constantin 1920 as Cypripedium curtisii drawing fide; Encyclopedia of Cultivated Orchids Hawkes 1965; AOS Bulletin Vol 37 No 2 1968 as Cypripedium curtisii var sanderae photo fide; Die Orchideen 3 Auflage Bd 1 Sonderabdruck aus Schlechter Lieferung 3 129 to 192; Brieger, Maatsch and Senghas 1971 photo fide; Orchid Digest Vol 42 No 5 1978 photo fide; AOS Bulletin Vol 49 No 3 1980 photo fide; Orchid Digest Vol 45 No 2 1981 photo fide; AOS Bulletin Vol 50 No 6 1981 photo fide; Orchid Digest Vol 45 No 5 1981 drawing fide; Orchid Digest Vol 49 No 2 1985 photo fide; AOS Bulletin Vol 54 No 4 1985 photo fide; Orchid Digest Vol 57 no 1 1993 drawing/photo fide; Orchid Digest Vol 59 No 3 1995 as P superbiens var curtisii photo fide; Orchid Digest Vol 59 No 3 1995 photo fide; The Genus Paphiopedilum Vol 1 & 2 Braem 1999; Australian Orchid Review Vol 65 No 6 2000 photo as P curtisii f sanderae; Orchid Digest Vol 74 #1 2010 as P curtisii f albaphoto fide; Orchid Digest Vol 76 #4 2012 as P superbiens var curtisii photo fide;
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