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. 2025 Apr 10:255:75-83.
doi: 10.3897/phytokeys.255.143043. eCollection 2025.

 Syzygiumtriflorum (Myrtaceae), a new species from Vietnam

Dang Hung Cuong  1 , Nguyen Thi Kim Thanh  2 , Nguyen Huu Hiep  1 , Dang Ngoc Huyen  1 , Thanh Truong Hoang  3 , Shuichiro Tagane  4
Affiliations

 Syzygiumtriflorum (Myrtaceae), a new species from Vietnam

Dang Hung Cuong et al. PhytoKeys. .

Abstract

Syzygiumtriflorum T.T.Hoang, Kim Thanh, S.Tagane & D.H.Cuong, sp. nov., from Kon Chu Rang Nature Reserve, Vietnam, is described and illustrated. The new species is distinguished from related species, Syzygiumskiophilum, by its having 4-angled and reddish-grey twigs, oblong leaves with an attenuate apex, less secondary veins of 26-30 pairs, exclusively axillary inflorescences, lanceolate-ovate bracts, sessile flowers, obconical hypanthium (slightly pyriform in flower buds) and more stamens of 18-28. The flowers and fruits were observed in the rainy season, July 2024. This new species grows under a mixed broad-leaved and coniferous forest dominated by Dacrydiumelatum and Dacrycarpusimbricatus.

Keywords: Flora; Indochina; Kon Chu Rang Nature Reserve; Myrtales.

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Conflict of interest statement

The authors have declared that no competing interests exist.

Figures

Figure 1.
Figure 1.
Syzygiumtriflorum T.T.Hoang, Kim Thanh, S.Tagane & D.H.Cuong A immature fruit in lateral view B immature fruits in top view C hypanthia in lateral view (after petals and most stamens had fallen off) D hypanthia with calyx disc and styles in top view (after petals and most stamens had fallen off) E inflorescence in top view, showing flowers before anthesis (left and right) F inflorescence in lateral view (3 flowers in cluster) G leafy branches H leaves, adaxial (upper) and abaxial (bottom) surface. Photos: H. T. Truong and H. C. Dang.
Figure 2.
Figure 2.
The dried flowers of Syzygiumtriflorum T.T.Hoang, Kim Thanh, S.Tagane & D.H.Cuong A 3-flowered inflorescence, in lateral view (with an orbicular petal in the left flower) B petal, adaxial surface C stamen (shorter one) D longitudinally dissected flower (with placenta axile). Photos taken by H. T. Truong and H. C. Dang.
Figure 3.
Figure 3.
Syntypes of Syzygiumskiophilum (Duthie) Airy Shaw A hypanthium of A.C. Maingay 738/2 (K000800033) B leaves of A.C. Maingay 738 (K000800034) and CA.C. Maingay 738/2 (K000800033). Image reproduced with permission of © The Board of Trustees of the RBG, Kew. http://specimens.kew.org/herbarium/K000800033; http://specimens.kew.org/herbarium/K000800034.
See this image and copyright information in PMC

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