Abstract

BENAVENTE, Lupe et al. CITES orchids of The Caserío El Hormiguero, El Carmen de la Frontera district, Huancabamba province, Piura region, Northwest of Peru. Arnaldoa [online]. 2020, vol.27, n.1, pp.9-25. ISSN 1815-8242.  http://dx.doi.org/10.22497/arnaldoa.271.27101.

We have evaluated the diversity, elevational distribution, vertical distribution and phenological status of Orchidaceae species present between 1100 and 2200 m on the western side of the Colorada ravine, district of El Carmen de la Frontera, Huancabamba province, Piura region, northern of Peru. We carried out nine study plots of 50x50 m2, divided in three strata, which were visited three times between 2016 and 2017, with a total of 6.75 hectares of covered land (0.24% of the Colorada ravine). We performed intensive search of specimens in the rocky, terrestrial and epiphytic substrates at each plot evaluated. We found 30 species and 18 taxa identified at the genus level, distributed in 26 genera, of which Epidendrum (with 8 taxa) and Pleurothallis (with 5 taxa) were the most diverse. Two new reports of Orchidaceae for Peru were made, Maxillaria pergracilis and Sarcoglottis grandiflora, and the report of an endemic species from Peru, Epidendrum gloria-imperatrix. The most diverse flowering period occurred in August, with 16 taxa. We reported 29 exclusively epiphytic species, an exclusively terrestrial umbrophilic species, seven exclusively terrestrial species of open habitats and none exclusively lithophilic. The elevational distribution of orchid species would indicate that, at least in this elevational range, at higher elevation, greater diversity of orchids. A more thorough evaluation can increase considerably and enrich the list of species reported during the present study, thus including perhaps new species for science or new reports for Peru.

Keywords : montane cloud forest; Tropical Andes; vascular epiphytes; altitudinal gradient; new reports; endemism.

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