Raphiocarpus taygiangensis (Gesneriaceae), a new species from central Vietnam

By

Nguyen, Cuong
Van Phung, Khoa
Sinh Nguyen, Khang
Averʹi︠a︡nov, L. V. (Leonid Vladimirovich), 1955-
Truong, Ba Vuong
Tran, Chu
Cao, Hai
Chu, Quan Ngoc
Vu, Hau Bich Thi
Pham, Thoa

Type

Article

Date of Publication

2023

Original Publication

PhytoKeys

Volume

218

Pages

19--27

Subjects

endemism , flora of eastern Indochina , new taxon , Plant Diversity , plant taxonomy

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers [2010]-

Identifiers

DOI: https://doi.org/10.3897/phytokeys.218.96511

 

Abstract

Raphiocarpus taygiangensis, 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, Rhaphiocarpus axillaris, are compared and discussed. The conservation status of the described species is estimated as Vulnerable (VU D2) according to the IUCN Red List Criteria.