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Lasianthus yaharae (Rubiaceae), a new species from Hon Ba Nature Reserve, southern Vietnam.

Last modified on 22/9/2015 at 4:28:00 PM. Total 1516 views.

Lasianthus yaharae V.S. Dang, Tagane & H. Tran (Rubiaceae) is described and illus-trated here based on material discovered in the Hon Ba Nature Reserve, southern Vietnam. It is most similar to L. dalatensis but differs in having fewer secondary veins in the leaves, a larger calyx and larger flowers (corolla tube and corolla lobes), and a different flower color at anthesis.

Lasianthus includes at least 180 species, among which more than 160 are distributed in tropical Asia, ca. 20 in Africa, one in Australia, and three in tropical America (Zhu 2002). This genus is taxonomically difficult because the morphological characters of the leaves, stipules and bracts are very variable, while the flowers and fruits are relatively small and most of the time missing from herbarium specimens, therefore leaving only a few diagnostic characters available for delineating the species (Zhu et al. 2012).

In recent years, taxonomic revisions of Lasianthus have been published for Thailand (Zhu 2001), China (Zhu 2002) and Malesia (Zhu et al. 2012), whereas the Vietnamese taxa remain poorly studied. At present, there are 31 species of Lasianthus recognized for Vietnam (Phạm 2000).

Between 2012 and 2014, we carried out numerous field surveys to assess the plant diversity at the Hon Ba Nature Reserve, southern

Vietnam. During one of our trips, we discovered a species of Lasianthus that was distinct from all the known congenerics reported to occur in Vietnam. We were also unable to find a match for this unidentified taxon in the Vietnamese Herbaria (HN and VNM) and The Forest Herbarium, Bangkok (BKF).

Lasianthus yaharae V.S. Dang, Tagae & H. Tran

Lasianthus yaharae V S. Dang, Tagane & H. Tran

Type. Vietnam. Khanh Hoa Province, Hon Ba Nature Reserve, near peak, montane evergreen forest dominated by Fagaceae, alt. 1521 m a.s.l., 12°07'06"N, 108°56'51"E, 18 July 2014 Tagane S., Kanemitsu H., Son V.D., Tran H. with Loi X.N., Thach N.D., Dinh N. & Hieu P.N.H. V1741 (holo- type VNM; isotypes FU!, KYO!, Station of Hon Ba Nature Reserve!, VNM!). — Paratype: Vietnam. Klianli Hoa Province, Hon Ba Nature Reserve, 30 km west of Nha Trang City, alt. 1521 m a.s.l., 12°07W'N, 108°56'51"E, 2 November 2012 Son V.D., Tagane S., Toyama H., Fuse K.. Naganiasu H„ Hop T, Lam T.T. & Yaliara T. VHB44 (VNM!).

Distribution and habitat.

Hon Ba Nature Reserve, Khanh Hoa Province, southern Vietnam. In moist evergreen forest, dominated by members of Fagaceae, at ca. 1500111 a.s.l.

(Annales Botanici Fennici)

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