Abstract
A new Masdevallia species from eastern Ecuador, is described, illustrated and compared with similar species. The species is most similar to Masdevallia aphanes; both species are small plants for the genus with weak inflorescences that bear striped flowers with acaudate sepals. The horizontal inflorescences with yellow flowers striped with red-brown and the convex, subpandurate lip of Masdevallia rubileoixchelorum immediately distinguishes it from the similar M. aphanes by the abaxially deep sandal-shaped lip and for the ovary with undulate-dentate ribs which are almost keeled.
References
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<p>Karremans, A.P. & Vieira-Uribe, S. (2020) Pleurothallids Neotropical Jewels – Volume I. Imprenta Mariscal, Quito, Ecuador. 312 pp.</p>
<p>Kolanowska, M. & Szlachetko, D.L. (2014) Notes on <em>Erycina</em>-complex with descriptions of new Colombian species. <em>Plant Systematics and Evolution</em> 300: 527–534. https://doi.org/10.1007/s00606-013-0901-z</p>
<p>Königer, W. (1985) <em>Masdevallia lilacina</em>, <em>Masdevallia monogon</em>a, <em>Masdevallia replicata</em>, <em>Masdevallia spilantha</em> - neue Arten aus Peru<em>. Die Orchidee</em> 36: 87.</p>
<p>Kränzlin, F. (1925) Monographie der Gattungen <em>Masdevallia, Lothiania, Scaphosepalum, Cryptophoranthus </em>&<em> Pseudooctomeria</em>. <em>Repertorium Specierum Novarum Regni Vegetabilis, Beihefte</em> 34: 92.</p>
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<p>Linnaeus, C. (1753) <em>Species Plantarum</em> 1. Salvius, Stockholm, pp. 535. [560 pp.]</p>
<p>López, P.J., López, M. & Gutiérrez del Pozo, D. (2016) <em>Fitonimia botánica y popular de las orquídeas de Ecuador y Cuba</em>. Prefectura de Pastaza, Quito, 213 pp.</p>
<p>Luer, C.A. (1980) <em>Trisetella</em>, a new name in the Pleurothallidinae (Orchidaceae). <em>Phytologia </em>47: 57–58. https://doi.org/10.5962/bhl.part.4453</p>
<p>Luer, C.A. & Escobar, R. (1991) <em>Thesaurus Dracularum</em>, Fascicle 4: A Monograph of the Genus <em>Dracula </em>/ Eine Monographie der Gattung <em>Dracula. </em>Missouri Botanical Garden Press.</p>
<p>Luer, C.A. (1999) Icones Pleurothallidinarum XVIII. Systematics of <em>Pleurothallis</em> subgen. <em>Pleurothallis</em>, sect. <em>Pleurothallis</em>, subsect. <em>Antenniferae</em>, subsect. <em>Longiracemosae</em>, subsect. <em>Macrophyllae–Racemosae</em>, subsect. <em>Perplexae</em>, subgen. <em>Pseudostelis</em>, subgen. <em>Acuminatia</em>. Addenda to <em>Dracula</em>, <em>Lepanthes</em>, <em>Masdevallia</em> and <em>Pleurothallis</em>. Miscellaneous new species of <em>Dryadella</em>, <em>Lepanthes</em> and <em>Pleurothallis</em>.<em> Monographs in Systematic Botany from the Missouri Botanical Garden</em> 76: 160–161.</p>
<p>Luer, C.A. (1978a) <em>Dracula</em>, a new genus in the Pleurothallidinae. <em>Selbyana</em> 2: 190–198.</p>
<p>Luer, C.A. (1978b) <em>Dryadella</em>, a new genus in the Pleurothallidinae (Orchidaceae). <em>Selbyana</em> 2: 207–209.</p>
<p>Luer, C.A. (1978c) Miscellaneous species of <em>Masdevallia </em>(Orchidaceae) from Ecuador, Peru and Bolivia. <em>Phytologia </em>39 (4): 212–213. https://doi.org/10.5962/bhl.part.7613</p>
<p>Luer, C.A. (1986a) Icones Pleurothallidinarum II. Systematics of <em>Masdevallia </em>(Orchidaceae). <em>Monographs in Systematic Botany from Missouri Botanical Garden</em> 16: 18.</p>
<p>Luer, C.A. (1986b) New species in <em>Brachionidium</em>, <em>Masdevallia</em>, and <em>Trisetella</em> (Orchidaceae). <em>Lindleyana</em> 1: 169–193.</p>
<p>Luer, C.A. (1994) New species of <em>Masdevallia </em>and a new combination (Orchidaceae) Part VII. <em>Lindleyana </em>9 (4): 243–253.</p>
<p>Luer, C.A. (2000a) Icones Pleurothallidinarum XIX. Systematics of <em>Masdevallia</em>. Part One. <em>Masdevallia</em> Subgenus <em>Polytantha</em>, section <em>Alaticaules</em>, Section <em>Polyanthae</em>. <em>Monographs in Systematic Botany from Missouri Botanical Garden</em> 77: 2.</p>
<p>Luer, C.A. (2000b) Icones Pleurothallidinarum XXI. Systematics of <em>Masdevallia</em>. Part Two. <em>Masdevallia</em> Subgenus <em>Masdevallia</em>, section <em>Coriaceae</em>, Section <em>Dentatae</em>, Section <em>Durae</em>, Section <em>Reichenbachianae</em>, M. Subgenus <em>Pygmaeia</em>. <em>Monographs in Systematic Botany from Missouri Botanical Garden</em> 82: 431–505.</p>
<p>Luer, C.A. (2006) Icones Pleurothallidinarum XXVIII. A reconsideration of <em>Masdevallia. </em>Systematics of <em>Specklinia </em>and vegetatively similar taxa (Orchidaceae). <em>Monographs in Systematic Botany from Missouri Botanical Garden</em> 105: 1–12</p>
<p>Markgraf, F. (1926) Myristicaceae. <em>In:</em> Mildbraed, J. (Ed.) <em>Plantae Tessmannianae peruvianae</em> III. <em>Notizblatt Des Königlicher Botanischen Gartens Und Museums Zu Berlin</em> 9: 964–997. https://doi.org/10.2307/3994448</p>
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