A New Species of Galeoglossum (Orchidaceae, Cranichidinae) from Oaxaca, Mexico

Authors: Salazar, Gerardo A.; Chávez-Rendón, César; Jiménez-Machorro, Rolando; de Ávila, Alejandro

Source: Systematic Botany, Volume 36, Number 2, April-June 2011, pp. 261-267(7)

Publisher: American Society of Plant Taxonomists

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Abstract:

Galeoglossum cactorum , a new species of Orchidaceae from the Mixteca Alta region in the state of Oaxaca, Mexico, is described and illustrated. The new species is florally similar to G. thysanochilum but differs from it in the linear-oblanceolate leaves subtended by imbricating, dark brown cataphylls, presence of a papillose thickening near the base of the labellum, proportionately shorter, obtrapezoid column with lateral laminar wings and complete fusion of the filament, and prominent apicule of the rostellum remnant. A cladistic parsimony analysis of DNA sequences of nuclear ITS region and plastid matK-trnK region showed that the three currently recognized species of Galeoglossum form a monophyletic group, which is sister to Prescottia. Galeoglossum cactorum is known from a single locality in an unusual habitat for orchids, i.e. a xerophilous scrub dominated by columnar cacti of the genus Neobuxbaumia, whereas both G. thysanochilum and G. tubulosum dwell in oak- and pine-oak forest.

Keywords: ENDEMISM; GALEOGLOSSUM CACTORUM; MATK-TRNK; MIXTECA ALTA; NRITS; PHYLOGENETICS

Document Type: Research Article

DOI: http://dx.doi.org/10.1600/036364411X569462

Publication date: April 1, 2011

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Systematic Botany is the scientific journal of the American Society of Plant Taxonomists and publishes four issues per year.

2011 Impact Factor: 1.517

2011 ISI Journal Citation Reports® Rankings: 87/190 - Plant Sciences

34/45 - Evolutionary Biology
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