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A SECOND LOOK AT THE GENUS SIGMATOSTALIX (ORCHIDACEAE: ONCIDIINAE) IN COSTA RICA

Franco Pupulin
Harvard Papers in Botany
Vol. 8, No. 1 (June 2003), pp. 35-59
Stable URL: http://www.jstor.org/stable/41761780
Page Count: 25
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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 SECOND LOOK AT THE GENUS SIGMATOSTALIX (ORCHIDACEAE: ONCIDIINAE) IN COSTA RICA
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Abstract

A new taxonomic treatment of the genus Sigmatostalix in Costa Rica is presented. All the species are described and illustrated, and a key is provided for identification of Costa Rican taxa. Three new species are described. Sigmatostalix cardioglossa and S. savegrensis are related to the Mesoamerican group close to S. picta, but lack retrorse lobules on the lip lamina. Sigmatostalix cardioglossa has a cylindrical, non-canaliculate claw, and a 3-mamillate callus on the disc. Sigmatostalix savegrensis presents lateral sepals connate to the middle, entire, rheniform lamina of the lip, and open, semicircular callus. Sigmatostalix hymenantha is lectotypified, its taxonomic concept is reconsidered and Costa Rican material previously referred to this taxon is described as 5. integrilabris. Sigmatostalix integrilabris is a close relative of S. adamsii (a species here excluded from Costa Rican flora), from which it can be distinguished by the much wider lamina of the lip provided with a smaller callus, and the long column with small apical wings.

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