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Issue: Vol. 715 No. 3: 22 Aug. 2025
Type: Article
Published: 2025-08-22
DOI: 10.11646/phytotaxa.715.3.5
Page range: 260-270
Abstract views: 415
PDF downloaded: 9

A new near-threatened species, Syzygium halmaherense (Myrtaceae), from Halmahera Island, Maluku, Indonesia

Research Center for Biosystematics and Evolution, Herbarium Bogoriense, National Research and Innovation Agency, Indonesia (BRIN). Jl. Raya Jakarta-Bogor, km 46, Cibinong, Bogor, West Java, 16911, Indonesia
Research Center for Biosystematics and Evolution, Herbarium Bogoriense, National Research and Innovation Agency, Indonesia (BRIN). Jl. Raya Jakarta-Bogor, km 46, Cibinong, Bogor, West Java, 16911, Indonesia
Research Center for Biosystematics and Evolution, Herbarium Bogoriense, National Research and Innovation Agency, Indonesia (BRIN). Jl. Raya Jakarta-Bogor, km 46, Cibinong, Bogor, West Java, 16911, Indonesia
Research Center for Applied Botany, National Research and Innovation Agency, Indonesia (BRIN). Jl. Raya Jakarta-Bogor, km 46, Cibinong, Bogor, West Java, 16911, Indonesia
Research Center for Ecology and Ethnobiology, National Research and Innovation Agency, Indonesia (BRIN). Jl. Raya Jakarta-Bogor, km 46, Cibinong, Bogor, West Java, 16911, Indonesia; Bureau for Organization and Human Resources, National Research and Innovation Agency, Indonesia (BRIN). Jakarta, 10340, Indonesia
Faculty of Biology, Jenderal Soedirman University. Jl. Dr. Soeparno, no. 63, Purwokerto, Central Java, 53122, Indonesia
IUCN Moluccas islands pollen Syzygium perspicuinervium taxonomy Weda Eudicots

Abstract

A new species of Myrtaceae, Syzygium halmaherense, is described from the Weda Bay area of Halmahera, Maluku, Indonesia. Syzygium halmaherense resembles S. perspicuinervium but differs in leaf and flower morphology. Syzygium halmaherense has shorter petioles, cordate bases, acute to obtuse apices, and lacks abaxial glandular-puncticulate, unlike S. perspicuinervium with longer petioles, broadly acute bases, acuminate apices, and numerous glandular-puncticulate. Syzygium halmaherense has panicle inflorescences with larger flowers, free sepals, and subcalyptrate petals, while S. perspicuinervium has fascicled or solitary inflorescences, smaller flowers, calyptrate sepals, and ovate petals. Scanning electron microscope analysis of S. halmaherense shows paracytic stomata on the abaxial leaves and monad pollen with a concave triangular shape, 3-syncolporate structure, sub-oblate P/E ratio, and weakly ornamented exine.

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How to Cite

Sunarti, S., Damayanto, I.P.G.P., Rugayah, Astuti, I.P., Kusuma, Y.W.C. & Widodo, P. (2025) A new near-threatened species, Syzygium halmaherense (Myrtaceae), from Halmahera Island, Maluku, Indonesia. Phytotaxa 715 (3): 260–270. https://doi.org/10.11646/phytotaxa.715.3.5