Oncidium longicornu Mutel 1838 SECTION Rhinocerotes
Photo by © Dalton Holland Baptista
Photo by © Lourens Grobler
to 
Common Name The Long-Horned Oncidium
Flower Size 2/5" [1 cm]
Found in Minas Gerais, Rio de Janiero, Sao Paulo, Parana, Santa Catarina and Rio Grande do Sul states of Brazil in the southeast Atlantic forest at elevations of 500 to 1800 meters, in shaded and humid places as a small sized, warm to cool growing epiphyte with clustered, oblong-conical, slightly compressed, ridged pseudobulbs carrying 1 or 2 apical, erect, rigid, oblong to oblong-ligulate, subacute leaves that are deep green above and paler below and blooms in the spring, summer and fall on a basal, 10 to 18" [25 to 45 cm] long, paniculate inflorescence with 6 to 10, spreading, subdistichous, slender branches carrying 7 to 20 flowers each, all held in the apical half and having membraneous floral bracts.
Synonyms Coppensia longicornu (Mutel) F.Barros & V.T.Rodrigues 2010; Coppensia macronyx (Rchb.f.) F.Barros & V.T.Rodrigues 2010; Epidendrum floridum Vell. 1831; Gomesa longicornu (Mutel) M.W.Chase & N.H.Williams 2009; Gomesa macronyx (Rchb.f.) M.W.Chase & N.H.Williams 2009; Gomesa rhinoceros (Rchb.f.) M.W.Chase & N.H.Williams 2009; Oncidium gautieri Regel 1868; Oncidium longicornu var. gautieri (Regel) Cogn. 1905; Oncidium longicornu var. grossmannii Dammer 1907; Oncidium macronyx Rchb. f. 1881; Oncidium monoceros Hook. 1841; Oncidium rhinoceros Rchb.f 1856; Oncidium unicorne Lindl. 1839; Oncidium unicorne var. laetum Rchb.f. 1882; Oncidium unicorne var. pictum Rchb.f. 1880: Oncidium unicornutum Knowles & Westc. 1838; Rhinocerotidium longicornu (Mutel) Szlach. 2006; Rhinocerotidium macronyx (Rchb.f.) Szlach. 2006; Rhinocerotidium rhinoceros (Rchb.f.) Szlach. 2006; Rhinocidium longicornu (Mutel) Baptista 2006; Rhinocidium macronyx (Rchb.f.) Baptista 2006;
References W3 Tropicos, Kew Monocot list , IPNI ; Otia Botanica Hamburgensia Rchb.f 1881 as O macronyx; Die Orchideen Schlechter 1915 as O unicorne; Atlas des Orchidees Cultivees Constantin 1920 as O unicorne drawing good; Das Pflanzanreich Regni Vegetabilis Conspectus Odontoglossum/Oncidium Kranzlin 1922 as O macronyx drawing ok; Das Pflanzanreich Regni Vegetabilis Conspectus Odontoglossum/Oncidium Kranzlin 1922 as Oncidium rhinoceros drawing good; Das Pflanzanreich Regni Vegetabilis Conspectus Odontoglossum/Oncidium Kranzlin 1922; Das Pflanzanreich Regni Vegetabilis Conspectus Odontoglossum/Oncidium Kranzlin 1922 as Oncidium unicorne; AOS Bulletin Vol 27 No 5 1958 drawing fide; Encyclopedia of Cultivated Orchids Hawkes 1965 as O unicorne; Orchidaceae Brasilenses Band 2 Pabst & Dungs 1977 as O macronyx drawing fide; Orchidaceae Brasilenses Band 2 Pabst & Dungs 1977 drawing fide; The Manual Of Cultivated Orchid Species Bechtel, Cribb & Launert 1992 drawing fide; Rudolf Schlechter Die Orchideen Band 1C lieferung 33 - 36 2057 - 2308 Brieger 1997; Rudolf Schlechter Die Orchideen Band 1C lieferung 33 - 36 2057 - 2308 Brieger 1997 as O macronyx drawing/photo fide; Rudolf Schlechter Die Orchideen Band 1C lieferung 33 - 36 2057 - 2308 Brieger 1997 as O rhinoceros; Orchid Digest Vol 63 #1 1999 as O rhinoceros photo fide; Australian Orchid Review Vol 66 No 2 2001 as O macronyx photo; The Pictoral Encyclopedia of Oncidium Zelenko 2002 as O macronyx; 100 Orquideas Argentinas Freuler 2005 photo fide; The Pictoral Encyclopedia of Oncidium Zelenko 2002; Oncidium Vol 1 Koniger 2004 Photo/drawing; Oncidium Vol 1 Koniger 2004 drawing/photo fide; Orchid Species Culture: Oncidium, Bakers 2006; Orchid Species Culture: Oncidium, Bakers 2006 as O macronyx; AOS Bulletin Vol 78 #4 2009 as Gomesalongicornu photo fide; Orchids of Brazil Vol 1 Oncidinae Baptista, Harding & Neto 2011 as Coppensia longicornu photo fide; Orchids of Brazil Vol 1 Oncidinae Baptista, Harding & Neto 2011 as Coppensia macronyx; AOS Bulletin Vol 86 # 3 2017 as oncidium monoceras AOS Bulletin Vol 86 # 3 2017 as Gomesa longicornu drawing fide;
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