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Issue: Vol. 694 No. 1: 18 Mar. 2025
Type: Article
Published: 2025-03-18
DOI: 10.11646/phytotaxa.694.1.4
Page range: 57-67
Abstract views: 284
PDF downloaded: 44

Two new species and one new addition of Lasianthus (Rubiaceae) for the flora of Vietnam

Institute of Life Sciences, Vietnam Academy of Science and Technology, 85 Tran Quoc Toan Street, District 3, Ho Chi Minh City, Vietnam; Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Vietnam; Iriomote Station, Tropical Biosphere Research Center, University of the Ryukyus, 870 Uehara, Taketomi-cho, Yaeyama-gun, Okinawa, 907-1541 Japan
Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Vietnam; Mien Trung Institute for Scientific Research, Vietnam National Museum of Nature, VAST, 321, Huynh Thuc Khang Street, ThuaThien Hue, Vietnam
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Ha Noi, Vietnam
Binh Chau-Phuoc Buu Nature Reserve,Ba Ria-Vung Tau Province, Vietnam
Forest Protection Department of Dakrong Nature Reserve, Quang Tri Province, Vietnam
Institute of Life Sciences, Vietnam Academy of Science and Technology, 85 Tran Quoc Toan Street, District 3, Ho Chi Minh City, Vietnam
Faculty of Forest Science, National University of Laos, Dongdok Campus, Xaythany District, Vientiane Capital, Laos
The Kagoshima University Museum, Kagoshima University, 1-21-30, Korimoto, Kagoshima, 890-0065, Japan
Iriomote Station, Tropical Biosphere Research Center, University of the Ryukyus, 870 Uehara, Taketomi-cho, Yaeyama-gun, Okinawa, 907-1541 Japan
Gentianales Hoa Binh Province Indochina Lasiantheae Quang Tri Province Rubioideae taxonomy Eudicots

Abstract

Two new species of Lasianthus (Rubiaceae), L. trongii and L. hoabinhensis, are described from Vietnam. Lasianthus trongii (sect. Nudiflorae) is closely related to L. tamdaoensis but distinguished by its glabrous branches, shorter petioles, 4 calyx lobes, smaller corolla, and drupes reddish-orange, larger, and with 4 pyrenes. Lasianthus hoabinhensis (sect. Lasianthus) is similar to L. attenuatus but differs in having larger leaf blades, more secondary veins of 9–11 pairs, 6 or 7 calyx lobes, smaller corolla, and drupes with 6 or 7 pyrenes. In addition, Lasianthus laoticus, previously known only from southern Laos, is recorded in Vietnam for the first time.

References

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How to Cite

Dang, V.-S., Le, T.A., Hoang, T.S., Le, van S., Ha, van B., Pham, Q.T., Phetlasy, S., Tagane, S. & Naiki, A. (2025) Two new species and one new addition of Lasianthus (Rubiaceae) for the flora of Vietnam. Phytotaxa 694: 57–67. https://doi.org/10.11646/phytotaxa.694.1.4