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Issue: Vol. 459 No. 4: 17 September 2020
Type: Article
Published: 2020-09-17
DOI: 10.11646/phytotaxa.459.4.2
Page range: 265–275
Abstract views: 31
PDF downloaded: 2

The genus Octarrhena (Orchidaceae, Thelasiinae) in Vietnam with description of two new species

Komarov Botanical Institute of the Russian Academy of Science
Tzitzin Main Botanical Garden of the Russian Academy of Sciences
4Institute of Tropical Biology, Vietnam Academy of Science and Technology, 85 Tran Quoc Toan, District 3, Ho Chi Minh City, Vietnam
Institute of Applied Technology, Thu Dau Mot University, No. 6, Tran Van On Street, Phu Hoa Ward, Thu Dau Mot City, Binh Duong Province, Vietnam.
Department of Plant Ecology and Geography, Biological Faculty, M.V. Lomonosov Moscow State University, 1, 12, Leninskie Gory, 119234, Moscow, Russia.
7Department of Higher Plants, Biological Faculty, M.V. Lomonosov Moscow State University, 1, 12, Leninskie Gory, 119234, Moscow, Russia.
Komarov Botanical Institute of the Russian Academy of Sciences, 2, Prof. Popov str., 197376, St. Petersburg, Russia
9Joint Russian-Vietnamese Tropical Scientific and Technological Center, South Department, 3, Str. 3/2, District 10, Ho Chi Minh City, Vietnam
Central Highlands eastern Indochina endemism orchids plant diversity plant taxonomy plant geography Monocots

Abstract

The genus Octarrhena (Orchidaceae) is distributed predominantly in Malesia and Papuasia. Its presence in eastern Indochina was uncovered as recently as in 2015 simultaneously with a description of O. minuscula from the Central Highlands of Vietnam. Here, we describe two more species of the genus, O. emarginata and O. perpusilla, also endemic to this mountain system. All three Vietnamese species of Octarrhena are local endemics with very limited allopatric distribution. We summarize the current knowledge on the genus in Vietnam and present a key for their identification, and a map with location of all known populations. Finally, we briefly discuss modern views on the worldwide species diversity of Octarrhena.