Cyrtochilum macranthum [Lindley] Kraenzel 1917 SECTION Eucyrtochilum Kranzlin
Photo by Danny Lentz, plant grown by Atlanta Botanical Garden
to 
Common Name The Large Flowered Cyrtochilum
Flower Size to more than 4", largest in genus [to more than 10 cm]
A cold growing, large sized, caespitose epiphyte from Colombia, Peru and Ecuador that is found in montane cloud forests at elevations up to 3000 meters with ovoid to conical, slightly compressed pseudobulbs enveloped basally by 3 to 4 imbricating sheaths and carrying 2 apical, linear-oblong to oblanceolate, acute leaves and blooms in the fall through spring on an axillary, stout, woody, to about 12' [360 cm] long overall, ascending to arcuate, long, paniculate, each 12" [30 cm] long branch 2 to 5 flowered, up to 70 flowered inflorescence arising on a just mature pseudobulb through the axil of the basal sheath carrying showy, long-lasting flowers.
Synonyms Cyrtochilum carrutherianum F.Lehm. & Kraenzl. 1922; Cyrtochilum hastiferum (Rchb.f. & Warsz.) Kraenzl. 1917; Oncidium hastiferum hort. 1875; *Oncidium macranthum Lindley 1833
References W3 Tropicos, Kew Monocot list , IPNI ; Lankester's Epidendra Website CR ; Bonplandia Rchb.f 1854 as Oncidium hastiferum; Bonplandia Rchb.f 1856 as Oncidium macranthum; Otia Botanica Hamburgensia Rchb.f 1878 as Oncidium macranthum; Die Orchideen Schlechter 1915 as Oncidium macranthum; Atlas des Orchidees Cultivees Constantin 1920 as Oncidium macranthum drawing fide; Das Pflanzenreich Odontoglossum/Oncidium Kranzlin 1922 drawing hmm; Das Pflanzenreich Odontoglossum/Oncidium Kranzlin 1922 as C hastiferum; AOS Bulletin Vol 26 No 7 1957 as Oncidium macranthum photo fide; AOS Bulletin Vol 27 No 7 1958 as Oncidium macranthum drawing fide; AOS Bulletin Vol 27 No 9 1958 as Oncidium macranthum photo fide; Orchid Digest Vol 24 #8 1960 as Oncidium macranthum photo fide; AOS Bulletin Vol 30 No 2 1961 as Oncidium macranthum photo fide; Orchids of Peru Vol 4 Schweinfurth 1961 as Oncidium macranthum; Orchids of Peru Vol 4 Schweinfurth 1961 as Oncidium macranthum var hastiferum; AOS Bulletin Vol 31 No 7 1962 as Oncidium macranthum photo fide; Encyclopedia of Cultivated Orchids Hawkes 1965 as Oncidium macranthum; AOS Bulletin Vol 37 No 1 1968 as Oncidium macranthum photo fide; Orchid Digest Vol 38 no 5 1974 as Oncidium macranthum photo fide; Orquideologia Vol 14 No 1 1979 as Oncidium macranthum photo fide; AOS Bulletin Vol 51 No 5 1982 as Oncidium macranthum photo fide; Icones Planetarum Tropicarum plate 478 Dodson 1982 as Oncidium macranthum drawing fide; Orchids Travel By Air A Pictoral Safari Mulder, Mulder-Roelfsema and Schuiteman 1990 as Oncidiu macranthum photo fide; Schlechteriana Vol 4 No 1/2 1993 drawing fide; The Manual Of Cultivated Orchid Species Bechtel, Cribb & Launert 1992 photo fide; The Manual of Cultivated Orchids Bechtel, Cribb, Launert 1992 as C superbiens photo fide; AOS Bulletin Vol 64 No 12 1995 as Oncidium macranthum photo fide; Icones Orchidacearum Peruviarum Plate 337 Bennett & Christenson 1995 as Oncidium macranthum drawing fide; Orchid Digest Vol 60 No 2 1996 photo fide; Rudolf Schlechter Die Orchideen Band 1C lieferung 33 - 36 2057 - 2308 Brieger 1997 drawing/photo fide; AOS Bulletin Vol 67 No 1 1998 photo fide; Orchid Digest Vol 63 #1 1999 as Oncidium macranthum photo fide; Australian Orchid Review Vol 66 No 2 2001 photo as Oncidium macranthum; AOS Bulletin Vol 70 No 8 2001 photo fide; Lindleyana Vol 16 No 2 2001; AOS Bulletin Vol 71 No 3 2002; The Pictoral Encyclopedia of Oncidium Zelenko 2002 drawing fide; Native Ecuadorian Orchids Vol 4 Dodson 2003 as Oncidium macranthum drawing/photo fide; AOS Bulletin Vol 73 No 3 2004; AOS Bulletin Vol 73 No 5 2004 photo fide; Orchid Digest Vol 70 #1 2006 photo fide; Orchid Species Culture: Oncidium/Odontoglossum alliance Bakers 2006; AOS Bulletin Vol 76 No 1 2007 photo fide; Orchid Digest Vol 71 No 1 2007 photo fide; AOS Bulletin Vol 77 No 8 2008 photo fide; AOS Bulletin Vol 77 No 11 2008 photo fide; Orquideologia Vol 25 #2 2008 photo fide; Orchid Species of Peru Zelenko Bermudez 2009 photo fide; Orquideas del Peru Freuler 2010 photo fide; Genera Orchidacearum Vol 5 Epidendroideaea Part 2 Pridgeon, Chase, Cribb & Rasmusen 2009 drawing fide; Flora of Ecuador No 87 225[3] Orchidaceae Dodson & Luer 2010 drawing fide; Orchid Digest Vol 75 #4 2011 Photo fide; Orquideas de Zamora Chinchipe Tomo 1 Epidendroideae I Jimenenz 2014 photo fide; AOS Bulletin Vol 83 #4 2014 photo fide; Orchids, A Colombian Treasure Vol 1 Ortiz & Uribe 2014 drawing/photo fide; Orchid Digest Vol 80 #1 2016 photo fide; AOS Bulletin Vol 85 #10 2016 photo fide; Orchid Digest Vol 81 #2 2017 photo fide; AOS Bulletin Vol 86 #2 2017 photo fide; AOS Bulletin Vol 88 #1 2019 photo fide; AOS Bulletin Vol 88 #3 2019 photo fide;
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