102 urn:lsid:arphahub.com:pub:73abe0ce-d97c-5d7c-bee5-b8e6e6fe6a17 ARPHA Preprints preprints Pensoft Publishers 10.3897/arphapreprints.e91110 91110 Research Article Gesneriaceae Taxonomy Asia Raphiocarpus Raphiocarpus taygiangensis (Gesneriaceae), a new species from Central Vietnam Nguyen Cuong nguyenhuucuong.tvr@gmail.com https://orcid.org/0000-0003-2281-741X 1 Van Phung Khoa https://orcid.org/0000-0002-9133-166X 2 Pham Thoa 3 Tran Chu 2 Cao Hai 2 Truong Ba Vuong https://orcid.org/0000-0003-3452-8455 4 Averyanov Leonid av_leonid@mail.ru 5 Sinh Nguyen Khang https://orcid.org/0000-0001-5171-4140 6 Vietnam National University of Forestry, Ha Noi, Vietnam Vietnam National University of Forestry Ha Noi Vietnam Vietnam National University of Forestry, Hanoi, Vietnam Vietnam National University of Forestry Hanoi Vietnam The University of Danang - University of Science and Technology, Da Nang, Vietnam The University of Danang - University of Science and Technology Da Nang Vietnam Institute of Tropical Biology, Ho Chi Minh, Vietnam Institute of Tropical Biology Ho Chi Minh Vietnam Komarov Botanical Institute of the Russian Academy of Science, St. Petersburg, Russia Komarov Botanical Institute of the Russian Academy of Science St. Petersburg Russia Institute of Ecology and Biological Resources Vietnam Academy of Science and Technology, Hanoi, Vietnam Institute of Ecology and Biological Resources Vietnam Academy of Science and Technology Hanoi Vietnam

Corresponding authors: Cuong Nguyen (nguyenhuucuong.tvr@gmail.com), Leonid Averyanov (av_leonid@mail.ru).

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2022 02 08 2022 3 34EB16A3-2BEE-597F-803B-97783237556C 01 08 2022 01 08 2022 Cuong Nguyen, Khoa Van Phung, Thoa Pham, Chu Tran, Hai Cao, Ba Vuong Truong, Leonid Averyanov, Khang Sinh Nguyen This is an open access preprint distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Raphiocarpus taygiangensis, a new species of Gesneriaceae from Tay Giang District, Quang Nam Province, Central Vietnam, is here described and illustrated. The new species is diagnostic by the combination of its long stem, serrate leaf margin, purple spots, purple longitudinal lines, and glandular short hairs inside corolla. Morphological distinctiveness of the new species from the most similar species, Raphiocarpus axillaris, is discussed. The conservation status of this species is estimated as Vulnerable (VU D2) according to the IUCN Red List Criteria.