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

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 adaxi...

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Bibliographic Details
Published in:PhytoKeys 2023-01, Vol.218 (1), p.19-27
Main Authors: Nguyen, Cuong Huu, Van Phung, Khoa, Sinh Nguyen, Khang, Averyanov, Leonid V, Truong, Vuong Ba, Tran, Chu Van, Cao, Hai Xuan, Chu, Quan Ngoc, Vu, Hau Bich Thi, Pham, Thoa Kim Thi
Format: Article
Language:English
Subjects:
Botany
Congeners
Conservation status
Discovery and exploration
Flowers
Flowers & plants
Gesneriaceae
Identification and classification
Leaves
Morphology
Native plants
New species
Stigmas (botany)
Threatened species
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Description
Summary: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.
ISSN:1314-2011
1314-2003
DOI:10.3897/phytokeys.218.96511