Taxonomic studies on Parahellenia (Costaceae) in Vietnam: a new species, P. trongduyii, and a new combination, P. candida

JUAN CHEN; VAN CANH NGUYEN; VAN KHUONG NGUYEN; KHANG SINH NGUYEN; MAXIM S. NURALIEV; NIANHE XIA

doi:10.11646/phytotaxa.583.1.7

Issue: Vol. 583 No. 1: 31 January 2023

Type: Article

Published: 2023-01-31

DOI: 10.11646/phytotaxa.583.1.7

Page range: 72–80

Abstract views: 31

PDF downloaded: 2

Taxonomic studies on Parahellenia (Costaceae) in Vietnam: a new species, P. trongduyii, and a new combination, P. candida

JUAN CHEN⁺⁻
VAN CANH NGUYEN⁺⁻
VAN KHUONG NGUYEN⁺⁻
KHANG SINH NGUYEN⁺⁻
MAXIM S. NURALIEV⁺⁻
NIANHE XIA⁺⁻

Key Laboratory of Plant Resources Conservation and Sustainable Utilization /Guangdong Provincial Key Laboratory of Digital Botanical Garden, South China Botanical Garden, Chinese Academy of Sciences, 510650, Guangzhou, People’s Republic of China, South China National Botanical Garden, 510650, Guangzhou, People’s Republic of China

Institute of Applied Technology, Thu Dau Mot University, No. 6 Tran Van On Street, Phu Hoa Ward, Thu Dau Mot City, Binh Duong Province, Vietnam

Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Street, Hanoi, Vietnam, Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Street, Hanoi, Vietnam

Joint Russian-Vietnamese Tropical Scientific and Technological Center, Nguyen Van Huyen Street, Cau Giay, Hanoi, Vietnam, Department of Higher Plants, Biological Faculty, M.V. Lomonosov Moscow State University, 1, 12, Leninskie Gory, 119234 Moscow, Russia

Key Laboratory of Plant Resources Conservation and Sustainable Utilization /Guangdong Provincial Key Laboratory of Digital Botanical Garden, South China Botanical Garden, Chinese Academy of Sciences, 510650, Guangzhou, People’s Republic of China, South China National Botanical Garden, 510650, Guangzhou, People’s Republic of China

Monocots Cheilocostus Hellenia morphology plant taxonomy

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Abstract

Parahellenia trongduyii, a new species of Costaceae from Vietnam, is described and illustrated. The new species is similar to P. tonkinensis, but differs in unbranched or barely branched stems, narrowly triangular-lanceolate glabrous buds, bract apex with a soft mucro, yellow to whitish yellow labellum with longitudinal orange to red lines at center, longer anther crest and stigma with a slightly bilobed dorsal appendage. A new combination, Parahellenia candida, is proposed for the species earlier known as Cheilocostus candidus. A key to Parahellenia in Vietnam is also provided.

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