Paphiopedilum callosum (Rchb. f.) Stein 1892 SUBGENUS Paphiopedilum SECTION Barbata Photo by Lourens Grobler

Another Flower Photo courtesy of Oak Hill Gardens

to and EARLY

Common Name The Callus Paphiopedilum - In Thailand - V'ang Kang Kop[Chang-mai], Maeng phu,ueang khang kop, rongthao nari, rongthao nang, ueang khangkhok

Flower Size about 4" [to 10 cm]

, Found in Thailand, Cambodia, Vietnam and Laos in primary, closed, evergreen seasonal, broadleafed lowland forests, mixed and coniferous woods and primary highland cloud forests in soils rich in silicates or on granite and sandstone at altitudes of 300 to 2000 meters as a medium sized, hot to cool growing, terrestrial or lithophytic orchid with 3 to 5, narrowly elliptic, oblong-elliptic or obovate, mottled dark green with pale green, acute and equally 2 or 3 lobed apically leaves blooming in the spring and early summer on a single flowered [occasionally 2], purple pubescent, erect, to 8 to 14" [20 to 40 cm] long, terminal inflorescence with ovate to elliptic, acute to subacute floral bracts that are 1/3 the length of the ovaries and carrying 1 to rarely 2, showy flowers.

This orchid grows with even water and fertilizer, plus humid, very shady conditions, year round.

Synonyms Cordula callosa Rolfe 1912; Cypripedium barbatum var. warnerianum T.Moore 1878; *Cypripedium callosum Rchb.f 1886; Cypripedium callosum var. sublaeve Rchb.f. 1888; Cypripedium crossii E. Morren 1865; Cypripedium schmidtianum Kraenzl. 1901; Paphiopedilum amabile sensu Guillam 1937; Paphiopedilum callosum subsp. sublaeve (Rchb.f.) Fowlie 1972; Paphiopedilum callosum var angustipetalum Guillam. 1924; Paphiopedilum callosum var. potentianum (O.Gruss & Roeth) P.J.Cribb 1998 ; Paphiopedilum callosum var schmidtianum [Kraenzl] Pfitzer 1903; Paphiopedilum callosum var. sublaeve (Rchb.f.) P.J.Cribb 1987; Paphiopedilum callosum var. warnerianum (T.Moore) Aver. 2007; Paphiopedilum crossii [Morren] Braem & Senghas 2000; Paphiopedilum crossii f. viniferum (Koop. & N.Haseg.) Braem & Chiron 2003; Paphiopedilum crossii var. potentianum (O.Gruss & Roeth) Braem & Senghas 2000; Paphiopedilum crossii var. sublaeve (Rchb.f.) Braem & Senghas 2000; Paphiopedilum potentianum O.Gruss & Roeth 1995; Paphiopedilum sublaeve (Rchb.f.) Fowlie 1979; Paphiopedilum viniferum Koop. & N.Haseg. 2000

References W3 Tropicos, Kew Monocot list IPNI ; Die Orchideen Schlechter 1915 photo fide; Die Orchideen Schlechter 1915 as P callosum var rossianum; Die Orchideen Schlechter 1915 as P callosum var sanderae; Die Orchideen Schlechter 1915 as P callosum var schmidtianum; Die Orchideen Schlechter 1915 as P callosum var sublaeve; Atlas des Orchidees Cultivees Constantin 1920 as Cypripedium callosum drawing fide; Flora of Malaya Vol 1 Holttum 1957; The Orchids of Thailand Seidenfadden & Smitnand 1959; AOS Bulletin Vol 29 #3 1960 as Cypripedium callosum photo fide; AOS Bulletin Vol 31 No 10 1962 as Cypripedium callosum photo fide; AOS Bulletin Vol 33 No 3 1964 as Cypripedium callosum photo fide; The Orchids of Thailand Seidenfaden & Smitinand 1964 corrections; Encyclopedia of Cultivated Orchids Hawkes 1965; AOS Bulletin Vol 39 No 11 1970 photo fide; Die Orchideen 3 Auflage Bd 1 Sonderabdruck aus Schlechter Lieferung 3 129 to 192 Brieger, Maatsch and Senghas 1971; Orchid Digest Vol 36 No 1 1972 drawing/photo fide; Orchid Digest Vol 36 No 4 1972 photo fide; Orchid Digest Vol 36 No 5 1972 as P callosum subs sublaeve photo fide; Botanisk Tidsserift 67: 76-127 Contributions to the Orchid Flora of Thailand IV Seidenfaden 1972 drawing fide; Orchid Digest Vol 38 no 5 1974; Orchid Digest Vol 38 no 4 1974 as P callosum var sublaeve photo fide; Beautiful Thai Orchid Species Kamemoto & Sagarik 1975 photo fide; Orchid Digest Vol 45 No 2 1981 photo fide; Orchid Digest Vol 45 No 2 1981 as P sublaeve photo fide; Orchid Digest Vol 45 No 2 1981 as P thailandensephoto fide; AOS Bulletin Vol 50 No 5 1981 photo fide; AOS Bulletin Vol 50 No 6 1981 photo fide; AOS Bulletin Vol 50 #6 1981 as P callosum sanderae photo fide; Orchid Digest Vol 45 No 2 1981 as P sublaeve photo; Orchid Digest Vol 45 No 2 1981 photo; AOS Bulletin Vol 51 No 7 1982 photo fide; AOS Bulletin Vol 51 No 10 1982 photo fide; AOS Bulletin Vol 52 No 2 1983 photo; AOS Bulletin Vol 54 No 2 1985 photo fide; AOS Bulletin Vol 55 No 12 1986 photo fide; AOS Bulletin Vol 56 No 4 1987 photo fide; AOS Bulletin Vol 56 No 12 1987 drawing fide; Schlechteriana Vol 2 No 1 1991 as P sublaeve photo fide; The Orchids of Penninsular Mayasia and Singapore Seidenfaden & Wood 1992 drawing fide; The Manual Of Cultivated Orchid Species Bechtel, Cribb & Launert 1992 photo fide; Thai Orchid Species Rakpaibulsombat 1992 photo fide; AOS Bulletin No 63 No 12 1994 photo fide; Identification of the Orchids [Orchidaceae Juss.] Vietnam Averyanov 1994; Orchid Digest Vol 59 No 3 1995 photo fide; Orchid Digest Vol 59 No 3 1995 as P callosum var sublaeve photo fide; Orchid Digest Vol 59 No 4 1995 photo fide; Orchid Digest Vol 60 #3 1996 as Cypripedium callosum sanderaephoto fide; The Genus Paphiopedilum Vol 1 & 2 Braem 1999; Australian Orchid Review Vol 65 No 6 2000 photo as P callosum f viridiflorum; Rudolf Schlechter Die Orchideen Band 1C lieferung 40 pg 2492 - 2564 Brieger 2000 as P crossii; Rudolf Schlechter Die Orchideen Band 1C lieferung 40 pg 2492 - 2564 Brieger 2000 as P crossii var sublaeve; A field Guide to the Wild Orchids of Thailand Vaddhanaphuti 2001 photo fide; A field Guide to the Wild Orchids of Thailand Vaddhanaphuti 2005 as P callosum var sublaeve photo fide; A to Z of South East Asian Orchid Species Vol 1 O'Byrne 2001 photo fide; AOS Bulletin Vol 73 No 4 2004 as P crossii photo fide; AOS Bulletin Vol 73 No 4 2004 photo as P viniferum; A field Guide to the Wild Orchids of Thailand Vaddhanaphuti 2005 photo fide; A field Guide to the Wild Orchids of Thailand Vaddhanaphuti 2005 as P callosum var sublaeve photo fide; AOS Bulletin Vol 76 No 3 2007 photo; Orchid Digest Vol 71 No 3 2007 photo fide; Orchid Digest Vol 71 No 3 2007 as P callosum var warnerianum photo fide; Orchid Digest Vol 71 No 3 2007 as P callosum var potentianum photo fide; Wild Orchids in Myanamar Vol 3 Tanaka 2007; Orchids of Vietnam, Illustrated survey, part 1 Averyanov 2008; Orchid Digest Vol 74 #1 2010 as P callosum f sanderae photo fide; Wild Orchids of Penninsular Malaysia Ong, O'Byrne, Yong & Saw 2011 photo fide; Flora Of Thailand Orchidaceae Vol 12 Part 1 Pedersen, Kurzweil, Suddee & Cribb 2011 drawing/photo fide; A to Z of South East Asian Orchid Species Vol 2 O'Byrne 2011 photo fide; Orchid Digest Vol 76 #4 2012 photo fide; Orchid Digest Vol 76 #4 2012 as P callosum var sublaeve photo fide; Orchid Digest Vol 76 #4 2012 as P potentianum photo fide; Orchid Digest Vol 78 #3 2014 drawing fide; AOS Bulletin Vol 86 # 7 2017 photo fide;

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