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.
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Ecuador
new species
Oncidiinae
ORCHIDACEAE
Sigmatostalix