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Issue: Vol. 613 No. 3: 14 Sept. 2023
Type: Article
Published: 2023-09-14
DOI: 10.11646/phytotaxa.613.3.1
Page range: 201-212
Abstract views: 967
PDF downloaded: 508

Truongsonia (Arecaceae: Arecoideae: Truongsonieae)—a new palm genus and tribe from Vietnam

Institute of Tropical Biology; Vietnam Academy of Science and Technology (VAST); 85 Tran Quoc Toan road; District 3; Ho Chi Minh City; Vietnam; Graduate University of Science and Technology; VAST; Hoang Quoc Viet; Cau Giay District; Ha Noi; Vietnam
Royal Botanic Gardens; Kew; Richmond; Surrey; TW9 3AE; United Kingdom
Royal Botanic Gardens; Kew; Richmond; Surrey; TW9 3AE; United Kingdom
Royal Botanic Gardens; Kew; Richmond; Surrey; TW9 3AE; United Kingdom
Royal Botanic Gardens; Kew; Richmond; Surrey; TW9 3AE; United Kingdom; Department of Biology; Aarhus University; Ny Munkegade 116; 8000 Aarhus C; Denmark
The New York Botanical Garden; Bronx; NY 10458-5126; U.S.A.
Monocots Quang Ngai Truong Son Range Podococcus

Abstract

A genus and species of palm from the Truong Son Range in Vietnam, Truongsonia lecongkietii, is described as new to science. Phylogenomic analysis strongly supports the placement of the new taxon in subfamily Arecoideae as sister to the African endemic tribe Podococceae, which comprises a single genus Podococcus. A new tribe Truongsonieae is also described to accommodate Truongsonia in the current phylogenetic classification of palms. Truongsonia is a dwarf, acaulescent, clump-forming palm bearing entire, bifid leaves with a fibre-like extension of the rachis through the sinus of the two lobes of the leaf. The interfoliar inflorescence is exserted on a long peduncle with 3­–4 tightly sheathing peduncular bracts and rachillae presented at the apex only. The ovary is triovulate-tricarpellate, but fruits are single-seeded. Truongsonia is Critically Endangered, with surveys locating only 10–15 plants in the wild. Swift conservation action is required to secure the future of this remarkable and phylogenetically isolated lineage of palms.

 

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