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A NEW SPECIES OF SIGMATOSTALIX (ORCHIDACEAE: ONCIDIINAE) FROM NORTHERN ECUADOR

Franco Pupulin, Gilberto Merino and Jhon Valle
Harvard Papers in Botany
Vol. 13, No. 1 (June 2008), pp. 47-53
Stable URL: http://www.jstor.org/stable/41761886
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
A NEW SPECIES OF SIGMATOSTALIX (ORCHIDACEAE: ONCIDIINAE) FROM NORTHERN ECUADOR
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Abstract

A new species of the genus Sigmatostalix, S. uncinata, is described and illustrated from the province of Carchi in northern Ecuador. Sigmatostalix uncinata is compared with S. aristulifera, from which it mainly differs by the subquadrate lateral lobes of the lip having an apical, linear, uncinate appendix (vs. narrowly dolabriform and apically emarginate-bilobed); and a semilunate, rounded, concave callus (vs. absent or reduced to a low keel). The phylogenetic position of Sigmatostalix is discussed, and previous infrageneric schemes of classification are reviewed. Se describe y se ilustra una nueva especie del género Sigmatostalix, S. uncinata, de la provincia de Carchi en el norte del Ecuador. Sigmatostalix uncinata se compara con S. aristulifera, de la cual difiere principalmente por los lóbulos del labelo subcuadrados, provistos de un apéndice apical linear, y en forma de gancho (vs. dolabriformes y ernarginado-bilobados en el ápice) y de un callo semilunado, redondo, cóncavo (vs. ausente o reducido a una quilla baja en S. aristulifera). Se discute la posición filogenética de Sigmatostalix y se reseñan los esquemas previos de clasificación infragenérica.

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