Research Paper

Taxonomic notes of the genus Eumachia DC. in the flora of Vietnam and description of a new species

Quoc Bao Nguyen, Ba Vuong Truong, Shuichiro Tagane, Tuan Anh Le, Van Ngot Pham, Van Toan Em Quach, Van Huong Bui, Tran Vy Nguyen

Published on: 29 March 2025

Page: 262 - 274

DOI: 10.6165/tai.2025.70.262

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    Abstract

    The genus Eumachia DC. has been poorly documented and studied in Vietnam. In this research, we provide a taxonomic revision of this genus based on available specimens. Five species, E. chasaliifolia, E. montana, E. ovoidea, E. sondangii, and E. straminea, are recognized in Vietnam: E. sondangii is described as new to science; E. straminea is recorded in the country for the first time; a new combination is provided for E. chasaliifolia, and two lectotypifications are made for Chassalia ovoidea and Psychotria chasaliifolia. For each species, description, color photographs, phenology, distribution, and habitat are provided. A key to the Vietnamese Eumachia species is also provided.

    Keyword: Chassalia, Gentianales, Indochina, Palicoureeae, plant diversity, Psychotria, Rubiaceae, taxonomy

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