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Issue: Vol. 446 No. 2: 27 May 2020
Type: Article
Published: 2020-05-27
DOI: 10.11646/phytotaxa.446.2.7
Page range: 135–140
Abstract views: 49
PDF downloaded: 1

Corybas circinatus (Orchidaceae), a new species from Palawan, the Philippines

Biodiversity Program, Taiwan International Graduate Program, Academia Sinica and National Taiwan Normal University, Taipei, 11529, Taiwan Department of Life Science, National Taiwan Normal University, Taipei, 11677, Taiwan Biodiversity Research Center, Academia Sinica, Taipei, 11529, Taiwan Botany Division, Philippine National Museum of Natural History, Padre Burgos Street, Ermita Manila 1000, Philippines.
Philippine Taxonomic Initiative, Inc, Botanica Building, El Nido, Palawan 5313, Philippines.
Philippine Native Plants Conservation Society Inc., Ninoy Aquino Parks and Wildlife Center, North Avenue, Diliman, Quezon City 1100, Philippines.
Institute of Biological Sciences, College of Arts and Sciences, University of the Philippines, Los Banos, College, Laguna 4031, Philippines.
Department of Botany, University of Wisconsin-Madison, Madison, WI 53706, USA.
National Herbarium of Victoria, Royal Botanic Gardens, Melbourne, VIC 3004, Australia.
Corybas Diuridae Acianthinae helmet orchid ultramafic Malesia taxonomy Monocots

Abstract

Corybas circinatus, a new species of helmet orchid endemic to ultramafic habitats on the island of Palawan, Philippines, is hereby described and illustrated. This species is distinct in bearing a small glandular protuberance at the front of its pedicel, a 4-lobed entire labellum, and a distinctive strongly incurved dorsal sepal. The general colouration of the floral and vegetative parts is also highly characteristic, and the general lowland to mid-montane ecology of the species is unique amongst the known Philippines Corybas.