Raphiocarpustaygiangensis (Gesneriaceae), a new species from central Vietnam

Cuong Huu Nguyen; Khoa Van Phung; Khang Sinh Nguyen; Leonid V Averyanov; Vuong Ba Truong; Chu Van Tran; Hai Xuan Cao; Quan Ngoc Chu; Hau Bich Thi Vu; Thoa Kim Thi Pham

doi:10.3897/phytokeys.218.96511

Raphiocarpustaygiangensis (Gesneriaceae), a new species from central Vietnam

PhytoKeys. 2023 Jan 10:218:19-27. doi: 10.3897/phytokeys.218.96511. eCollection 2023.

Authors

Affiliations

¹ Vietnam National University of Forestry, Xuan Mai, Chuong My, Ha Noi, Vietnam Vietnam National University of Forestry Ha Noi Vietnam.
² Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Nghia Do, Cau Giay, Hanoi, Vietnam Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology Hanoi Vietnam.
³ Komarov Botanical Institute Russian Academy of Sciences, Prof. Popov str., 2, St. Petersburg, 197376, Russia Komarov Botanical Institute Russian Academy of Sciences St. Petersburg Russia.
⁴ Institute of Tropical Biology Vietnam Academy of Science and Technology, 85 Tran Quoc Toan, District 3, Ho Chi Minh City, Vietnam Institute of Tropical Biology Vietnam Academy of Science and Technology Ho Chi Minh Vietnam.
⁵ Ba Vi National Park, Tan Linh, Ba Vi, Hanoi, Vietnam Ba Vi National Park Hanoi Vietnam.
⁶ Department of agriculture and rural development, Hai Chau District, Danang City, Vietnam Department of agriculture and rural development Danang Vietnam.
⁷ The University of Danang - University of Science and Technology, 54 Nguyen Luong Bang str., Lien Chieu District, Danang City, Vietnam The University of Danang - University of Science and Technology Danang Vietnam.

Abstract

Raphiocarpustaygiangensis, a new species of Gesneriaceae family discovered in Tay Giang District, Quang Nam Province, Central Vietnam, is here described and illustrated. The new species is diagnosed by the combination of its stem up to 2 m long, sericeous hairs on young stem, leaf petiole and adaxial mid-vein, sparsely and minutely serrate leaf margin, axillary inflorescence spreading along stem, sparsely long gland-tipped hairs on peduncle, pedicel, calyx, outside corolla and pistil, calyx 5-disparted from base, purplish white flower with purple stripes inside corolla tube, and dish-shaped stigma formed by 2 semi-orbicular lobes horizontally expanding. Distinct features of the new species and its morphologically closest congener, Rhaphiocarpusaxillaris, are compared and discussed. The conservation status of the described species is estimated as Vulnerable (VU D2) according to the IUCN Red List Criteria.

Keywords: endemism; flora of eastern Indochina; new taxon; plant diversity; plant taxonomy.

Cuong Huu Nguyen, Khoa Van Phung, Khang Sinh Nguyen, Leonid V. Averyanov, Vuong Ba Truong, Chu Van Tran, Hai Xuan Cao, Quan Ngoc Chu, Hau Bich Thi Vu, Thoa Kim Thi Pham.