Two new species and one new addition of Lasianthus (Rubiaceae) for the flora of Vietnam
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.
Authors
- Van Nam Ha
- Lê Văn Sơn (ORCID: https://orcid.org/0000-0003-0151-0646)
- Văn Sơn Đặng (ORCID: https://orcid.org/0000-0001-8681-4141)
- Shuichiro Tagane (ORCID: https://orcid.org/0000-0002-1974-7329)
- QUOC TRONG PHAM (ORCID: https://orcid.org/0009-0004-6879-7535)
- Akiyo Naiki (ORCID: https://orcid.org/0000-0002-3235-2823)
- Phetlasy Souladeth (ORCID: https://orcid.org/0000-0001-8563-1773)
- Hoang Thanh Son (ORCID: https://orcid.org/0000-0003-0351-929X)
- Anh Tuấn Lê (ORCID: https://orcid.org/0000-0002-5917-3243)
Institutions
- Kagoshima University (JP)
- University of the Ryukyus (JP)
- Fanjingshan National Nature Reserve (CN)
- Forest Industry Research Institute (VN)
- Baikal Nature Reserve (RU)
- National University of Laos (LA)
- Vietnamese Academy of Forest Sciences
- Vietnam Academy of Science and Technology (VN)
Publication Details
- Journal
- Phytotaxa
- Published
- 2025-03-17
- DOI
- https://doi.org/10.11646/phytotaxa.694.1.4
- Primary Topic
- Plant and Fungal Species Descriptions
- Type
- article
- Field-Weighted Citation Impact
- 0.00