Leptomischus multiflorus (Argostemmateae: Rubiaceae), a new species from southern Vietnam

MAXIM S. NURALIEV; KHANG SINH NGUYEN; THOA KIM THI PHAM; CUONG HUU NGUYEN; BUI HONG QUANG; DMITRY F. LYSKOV; ANDREY N. KUZNETSOV; SVETLANA P. KUZNETSOVA; LEI WU

doi:10.11646/phytotaxa.574.1.5

Issue: Vol. 574 No. 1: 25 November 2022

Type: Article

Published: 2022-11-25

DOI: 10.11646/phytotaxa.574.1.5

Page range: 83-90

Abstract views: 35

PDF downloaded: 3

Leptomischus multiflorus (Argostemmateae: Rubiaceae), a new species from southern Vietnam

MAXIM S. NURALIEV⁺⁻
KHANG SINH NGUYEN⁺⁻
THOA KIM THI PHAM⁺⁻
CUONG HUU NGUYEN⁺⁻
BUI HONG QUANG⁺⁻
DMITRY F. LYSKOV⁺⁻
ANDREY N. KUZNETSOV⁺⁻
SVETLANA P. KUZNETSOVA⁺⁻
LEI WU⁺⁻

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

Department of Botany, Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam. Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam.

The University of Danang - University of Science and Technology, 54 Nguyen Luong Bang str., Lien Chieu District, Danang City, Vietnam.

Vietnam National University of Forestry, Xuan Mai, Chuong My, Hanoi, Vietnam.

Department of Botany, Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam. Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam.

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

Joint Russian-Vietnamese Tropical Scientific and Technological Center, Nguyen Van Huyen str., Cau Giay, Hanoi, Vietnam. A.N. Severtsov Institute of Ecology and Evolution of the Russian Academy of Sciences, 33 Leninsky av., 119071 Moscow, Russia.

Joint Russian-Vietnamese Tropical Scientific and Technological Center, Nguyen Van Huyen str., Cau Giay, Hanoi, Vietnam.

College of Forestry, Central South University of Forestry and Technology, 410004 Changsha, China.

eastern Indochina plant diversity plant taxonomy Quang Nam Province Eudicots

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Abstract

Leptomischus multiflorus, a new species of the tribe Argostemmateae (Rubiaceae), is described and illustrated. The species was discovered in 2022 in Quang Nam Province, southern Vietnam. The new species is characterized by rich indumentum on almost all plant parts, distylous flowers, and minutely puberulent ovary disk. Leptomischus multiflorus differs from all its congeners by the following features: leaf blades up to 23 cm long with up to 25 pairs of secondary veins, many-flowered inflorescences, and corolla tube 7–8 mm long and hairy outside. It additionally differs from the morphologically closest species, L. anisophyllus, in weakly anisophyllous to nearly isophyllous leaves, calyx lobes 2–2.5 mm long (about 1/3 length of corolla tube), corolla lobes with horn-like appendages, anthers 1–1.3 mm long, style hairy in distal half, pin flowers with filaments adnate at the middle of the corolla tube and with stigma lobes 1 mm long, and thrum flowers with style 2.5–3 mm long.

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