Cyrtochilum tricostatum Kraenzl. 1922 SECTION Cimicifera Lindley

Another Flower?

Photo by © Lourens Grobler

Common Name The Three Ribbed Cyrtochilum

Flower Size.6" [1.5 cm]

Found in Ecuador and Peru on mossy trees or on steep slopes as a terrestrial at elevations of 2000 to 3000 meters as a medium sized, cold growing epiphyte or terrestrial with ovoid to narrowly pear-shaped, laterally compressed pseudobulbs partially enveloped basally by several sets of imbricating, leaf-bearing sheaths and carrying 2, apical, narrow, acute, strap-shaped to lanceolate, conduplicate below into the base leaves that blooms in the summer and fall on an axillary, 20 to 31" [50 to 80 cm] long, peduncle 7.6 to 13.2" [19 to 33 cm] long, paniculate, short, spreading, fractiflex branches, 3 to 4 flowered each branch, many flowered inflorescence arising on a maturing pseudobulb.

The first photo matches the photo in Native Ecuadorian Orchids exactly. The second photo seems to me to be closer to C murinum.

Synonyms Irenea tricostata (Kraenzl.) Szlach., Mytnik, Górniak & Romowicz 2006; Oncidium exasperatoides D.E.Benn. & Christenson 2001; Oncidium ovatilabium C. Schweinf. 1946; Oncidium tricostatum (Kraenzl.) Garay 1970; Trigonochilum exasperatoides (D.E.Benn. & Christenson) Königer 2008; Trigonochilum tricostatum (Kraenzl.) Königer & Schildh 1994

References W3 Tropicos, Kew Monocot list , IPNI ; *Das Pflanzenreich Odontoglossum/Oncidium Kranzlin 1922; AOS Bulletin Vol 14 #2 1946 as Oncidium ovatilabium drawing fide; Orchids of Peru Vol 4 Schweinfurth 1961 aOiovatilabium drawing fide; Icones Planetarum Tropicarum Series II Orchids of Peru Plate 0146 Dodson & Bennett 1989 as Oncidium tricostatum drawing fide; Icones Orchidacearum Peruviarum Plate 340 Bennett & Christenson 1995 drawing fide; Rudolf Schlechter Die Orchideen Band 1C lieferung 33 - 36 2057 - 2308 Brieger 1997as Trigonochilum tricostatum photo fide; Icones Orchidacearum Peruviarum Supplemental Plate Bennett & Christenson 1998 drawing fide; Lindleyana Vol 16 No 2 2001; Icones Orchidacearum Peruviarum Plate 735 Bennett & Christenson 2001 as Oncidium exasperatoides drawing ok; The Pictoral Encyclopedia of Oncidium Zelenko 2002 as C ovatilabium drawing fide; Native Ecuadorian Orchids Vol 4 Dodson 2003 as Oncidium tricostatum photo fide; Orchid Species Culture: Oncidium/Odontoglossum alliance Bakers 2006; The Pictoral Encyclopedia of Oncidium Zelenko 2002; Flora of Ecuador No 87 225[3] Orchidaceae Dodson & Luer 2010 drawing fide; Orquideas de Zamora Chinchipe Tomo 1 Epidendroideae I Jimenenz 2014 photo fide; LANKESTERIANA 14(1) 2014 as Oncidium exasperatoides