Research Paper

Cynanchum quangbinhense (Apocynaceae: Asclepiadoideae), a new species from Vietnam, and additional information on C. officinale

Van The Pham, Thanh Trang Pham, Ngoc Bon Trinh, Sinh Khang Nguyen, Minh Truong Dao, Maxim S. Nuraliev

Published on: 26 October 2021

Page: 459 - 465

DOI: 10.6165/tai.2021.66.459

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    Abstract

    This research provides a description and illustrations for a new species from the Phong Nha-Ke Bang National Park, Cynanchum quangbinhense. The distribution, habitat, phenology and conservation assessment for the species are also presented. The new species differs from closely related species, C. ovalifolium in many characters such as leaf shape, inflorescence type, fewer and smaller flowers, colour of petals, margins of the corona, and anthers appendages shape, and differs from C. kwangsiense in having small leaves, umbellate inflorescences, triangular sepals, retuse apex of petals, and plicate margin of corona. Our discovery raises the known species of this genus in Vietnam to seven. In addition, a key to species of Cynanchum in Vietnam, and notes on morphological variation of C. officinale are presented in this paper.

    Keyword: Cynanchum kwangsiense, C. ovalifolium, conservation, Indochina, IUCN, National Park, taxonomic key

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