Hello, presumably you would find a key for identification in C. A. Luer (1996): "Icones Pleurothallidinarum XIII. Systematics of Restrepia (Orchidaceae). (= Monographs in Systematic Botany from the Missouri Botanical Garden 59). At least, that's what a review bei K. Barringer (in Journal of the Torrey Botanical Society 124:336) suggests: "Keys for identifications are included". (I've seen the review but not Luer's monograph.)

You have to check the dissected flowers in order to see morphological differences among two species. In Restrepia dodsonii the petals have a minute basal teeth-like lobes; in R. lansbergii the petals are entire, there are not lateral lobes. Also, In R. dodsonii the lip is relatively narrower, markedly constricted above its base and spiculate along the margins, while in R. lansbergii the lip is comparatively broader, not constricted throughout its length, and with entire or at least minute serrate margins.

Hi, this information (about the two species that you need) can you help and this link  have the peper of  a consideration of generic validity  the Restrepia pg :141 (is it's old, but it helps  http://ia600602.us.archive.org/24/items/mobot31753003541775/mobot31753003541775.pdf )

Restrepia lansbergii Rchb.f. & H.Wagener

• Breedlove, D.E. 1986. Flora de Chiapas. Listados Floríst. México 4: i–v, 1–246.
• Govaerts R. (ed). For a full list of reviewers see: http://apps.kew.org/wcsp/compilersReviewers.do (2013). WCSP: World Checklist of Selected Plant Families (version Oct 2011). In: Species 2000 & ITIS Catalogue of Life, 11th March 2013 (Roskov Y., Kunze T., Paglinawan L., Orrell T., Nicolson D., Culham A., Bailly N., Kirk P., Bourgoin T., Baillargeon G., Hernandez F., De Wever A., eds). Digital resource at www.catalogueoflife.org/col/. Species 2000: Reading, UK.
•  Hamburger Garten- und Blumenzeitung 21: 300. 1865. (Hamburger Garten- Blumenzeitung)
•  Rchb.f. & H.Wagener. 1854. In: Bonplandia (Hannover) 2: 23

Restrepia dodsonii Luer (esta es la endémica de Ecuador)

Imagen   http://media.eol.org/content/2012/06/14/21/78543_orig.jpg

Acá puedes descargar la descripción publicada por Luer en Phytolgia en la página 382 y 383 http://www.biodiversitylibrary.org/page/13043934#page/400/mode/1up

• Dodson, C.H. & P.M. Dodson. 1980. Orchids of Ecuador. Icon. Pl. Trop. 3: 201–300.
• Dodson, C.H. 2003. Oncidium–Restrepiopsis. 4: 665–883. In C.H. Dodson Native Ecuad. Orchids. Colina, Medellin.
• Govaerts R. (ed). For a full list of reviewers see: http://apps.kew.org/wcsp/compilersReviewers.do (2013). WCSP: World Checklist of Selected Plant Families (version Oct 2011). In: Species 2000 & ITIS Catalogue of Life, 11th March 2013 (Roskov Y., Kunze T., Paglinawan L., Orrell T., Nicolson D., Culham A., Bailly N., Kirk P., Bourgoin T., Baillargeon G., Hernandez F., De Wever A., eds). Digital resource at www.catalogueoflife.org/col/. Species 2000: Reading, UK.
• Jørgensen, P. M. & S. León-Yánez. (eds.) 1999. Cat. Vasc. Pl. Ecuador, Monogr. Syst. Bot. Miss. Bot. Gard. 75: i–viii, 1–1181. Missouri Botanical Garden, St. Louis.
• León Yánez, S., R. Valencia Reyes, N. C. A. Pitman, L. Endara, C. Ulloa Ulloa & H. Navarrete. 2011. Libro Rojo Pl. Endémic. Ecuador, 2 ed. 1–957. Herbario QCA, Pontificia Universidad Católica del Ecuador, Quito.
• Luer, C. A. & R. Escobar Restrepo. 1996. Icones Pleurothallidinarum–XIII. Systematics of Restrepia (Orchidaceae). Monogr. Syst. Bot. Missouri Bot. Gard. 59: 1–168.
• Luer, C. A. 1980. Miscellaneous new species in the Pleurothallidinae (Orchidaceae). Phytologia 46(6): 345–386.
• Luer. 1980. In: Phytologia 46: 382
• Phytologia 46(6): 382. 1980. (Phytologia)
• Valencia Reyes, R., N. C. A. Pitman, S. León-Yánez & P. M. Jørgensen. 2000. Libro Rojo Pl. Endémic. Ecuador 2000 i–v, 1–489. Herbario QCA, Pontificia Universidad Católica del Ecuador, Quito.

Espero sirva.

Cristian C.