A new variety of Panax (Araliaceae) from Lam Vien Plateau, Vietnam and its molecular evidence

NONG VAN DUY; LE NGOC TRIEU; NGUYEN DUY CHINH; VAN TIEN TRAN

doi:10.11646/phytotaxa.277.1.4

Issue: Vol. 277 No. 1: 23 September 2016

Type: Article

Published: 2016-09-23

DOI: 10.11646/phytotaxa.277.1.4

Page range: 47–58

Abstract views: 22

PDF downloaded: 1

**A new variety of Panax (Araliaceae) from Lam Vien Plateau, Vietnam and its molecular evidence**

NONG VAN DUY⁺⁻
LE NGOC TRIEU⁺⁻
NGUYEN DUY CHINH⁺⁻
VAN TIEN TRAN⁺⁻

Tay Nguyen Institute for Scientific Research, Vietnam Academy of Science and Technology, 116 Xo Viet Nghe Tinh, Dalat City, Lam Dong Province, Vietnam

Faculty of Biology, Da Lat University, 01 Phu Dong Thien Vuong, Dalat city, Lam Dong Province, Vietnam

IUCN molecular phylogeny relationship taxonomy Eudicots

Requires Subscription or Fee PDF (2MB)

Abstract

A new variety of Panax, P. vietnamensis var. langbianensis is described from Lang Bian Mountain, Lam Vien Plateau in southern Vietnam. It is visually distinct from other two varieties of P. vietnamensis (var. vietnamensis, var. fuscidiscus) by having the shorter petiolules 8–11 mm long, leaflet apex acuminate, pedicels 0.4–0.6 cm, petals smaller, disk prominent, and styles typically 2 (or rarely 1). The recognition of the new variety is supported by the evidence of molecular sequence data from three markers (ITS1-5.8S-ITS2, 18S rRNA and partial matK) in addition to morphological consideration. The new variety is known only from one population from the locality where the type specimens were collected. The species occurs in an area of only approximately 1 km² with a population size of approximately 100–200 individuals. Therefore it should be regarded as critically endangered (CBB2acb (ii,iii,v); C2a(i); E) according to the IUCN Red List Categories and criteria.