Habenaria dusenii Schltr.1919 SECTION Nudae
Drawing by © Foldats
Drawing by © Hoehne
Photos by © A. N. Batista; Joćo Batista F. da Silva; Luciano de Bem Bianchetti and the Orquideas de Minas Gerais; El Genero Habenaria
LATER 
Common Name Dusen's Habenaria [Swedish Engineer and Plant Collector in Brazil early 1900's]
Flower Size 1" [2.5 cm]
Found in Venezuela, French Guiana, Surinam?, Matto Grosso, Goias, Parana', Minas Gerais and Sao Paulo states of Brazil in open grasslands, swamps and shrublands at elevations of 50 to 600 meters as a small to medium sized, hot to warm growing terrestrial with a slender, erect stem carrying 4 to 5, distichous, linear, acute, basally adpressed leaves that blooms in the later spring and summer on an erect, terminal, 3.2" [8 cm] long, laxly 1 to 7 flowered inflorescence with lanceolate-ovate, acuminate, much shorter than the ovary floral bracts and carrying greenish-yellow flowers.
"Similar in habit to both H schomburgkii and H sprucei but distinguished from the later by the longer spur .96 to 1.04" [2.4 to 2.6 cm versus .32 to .48" [.8 to 1.2 cm] and the anterior petal lobe of H dusenii is twice longer than the posterior petal lobe while in H sprucei they are the same to just slightly longer. According to Batista [2208] this species is similar in flower morphology to H rodiensis, H longipedicellata and H longipedicellata but H schomburgkii and H dusenii the rostellum middle lobe is less prominent and inserted between the anterior petal lobe which is twice longer than the posterior one versus shorter to equal to the posterior one and the spur is shorter than the pedicellate ovary versus longer than the pedicellate ovary." Szlachetko & Kolanowska 2017
Synonyms Rhinorchis dusenii (Schltr.) Szlach. 2012
References W3 Tropicos, Kew Monocot list , IPNI ;
* Repert. Spec. Nov. Regni Veg. 16: 251 Schlechter 1919
Flora Brasilica Vol XII I Hoehne 1940 drawing fide;
Iconografia de Orchidaceae Do Brasil Hoehne 1949 drawing fide;
Flora de Venezuela Volumen 15 Parte 1 Foldats 1969 drawing fide;
Orchidaceae Brasilenses Band 1 Pabst and Dungs 1975 drawing fide;
Flora of the Venezuelan Guayana Vol 7 Steyermark, Berry, Yatskievych and Holst 2003;
Richardiana 13: 74 Szlach. 2012 as Rhinorchis dusenii
Orquideas de Minas Gerais; El Genero Habenaria Joćo A. N. Batista; Joćo Batista F. da Silva; Luciano de Bem Bianchetti; Rev. bras. Bot. vol.31 no.1 Sćo Paulo Jan./Mar. 2008 photo;
Orchids of French Guiana Szlachetko, Veyret, Mytnik-ejsmont, Sawicka, Rutkowski and Baranov 2012 as Rhinorchis dusenii drawing fide;
Materials to the Orchid Flora of Colombia Vol 1:203 Szlachetko & Kolanowska 2017 as Rhinorchis dusenii drawing fide
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