Authors: Nguyen, Cuong Huu; Phung, Khoa Van; Nguyen, Khang Sinh; Averyanov, Leonid V.; Truong, Vuong Ba; Tran, Chu Van; Cao, Hai Xuan; Chu, Quan Ngoc; Vu, Hau Bich Thi; Pham, Thoa Kim Thi
Publication: PhytoKeys
Year: 2023
Genera: Raphiocarpus

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.