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| Memecylon longipedunculatum in Tagane, Dang, Truong, Q. B. Nguyen, Pham, T. V. Nguyen, Yamamoto, Kongxaisavath, Yamazaki, Nuraliev, Fomichev et Souladeth, 2025. |
Abstract
Memecylon longipedunculatum, a new species of Melastomataceae, is described and illustrated. The species is known to occur in Khanh Hoa and Ninh Thuan provinces in South Central Coast Vietnam, where it is restricted to low dry coastal forests and scrubby vegetation. The description is based on the authors’ original gatherings as well as on the historical collections made a century ago. The new species is distinguishable from most of its congeners by small leaves (1.2–5.7 × 0.7–2.4 cm) with obtuse or sometimes emarginate apices, long peduncles (1–2.7 cm long), and crescent-shaped anther connective with distinct centrally placed gland.
Indochina, Myrtales, taxonomy, Olisbeoideae, Eudicots
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| Memecylon longipedunculatum. A, B. Flowering branches. C, D. Leaf, adaxial and abaxial side. E. Inflorescence. F. Flower, top view. G. Stamen, side view. H. Anther, side view. I. Post-anthetic flower (after abscission of petals and stamens). J. Mature flower bud. Nuraliev & Fomichev NUR 4192 (A, E–J) and Nuraliev NUR 3340 (B–D). Photos by M.S. Nuraliev. |
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| Memecylon longipedunculatum. A. Flowering branch. B. Abaxial leaf surface. C. Bark. D. Inflorescence. E. Top view of flower bud (up-left), anthetic flower (bottom), and post-anthetic flower (up-right). F. Inflorescence branch with anthetic and post-anthetic flowers. G. Fruiting stage of inflorescence. Tagane et al. N465 (A, D–F) and Tagane et al. N216 (B, C, G). Photos by S. Tagane. |
Memecylon longipedunculatum Tagane, V.S.Dang & Nuraliev, sp. nov.
Diagnosis:—Memecylon longipedunculatum is similar to M. chevalieri Guillaumin (1921a: 7, see also Guillaumin 1921b: 936) distributed in Cambodia, Laos and Vietnam by having axillary and terminal inflorescences with relatively long peduncles 1–2.7 cm long (vs. almost 1.5 cm long in M. chevalieri), but distinguished from the latter species by its smaller leaf blades (1.2–5.7 × 0.7–2.4 cm vs. 4–7 × 2–4 cm), longer pedicels (3.3–5.5 mm vs. 2–3 mm long), longer petals (ca. 4 mm vs. 2–3 mm long) with acute (vs. acuminate) apex, and subglobose (vs. ovoid-globose) fruits
Etymology:—The species epithet refers to its long peduncles (up to 2.7 cm long in flower and to 5.1 cm long in fruit), one of the remarkable features distinguishing it from most of its congeners in the Indochinese Peninsula.
Vernacular name:—Sầm cuống dài (Vietnamese).
Shuichiro TAGANE, Van-Son DANG, Ba Vuong TRUONG, Quoc Bao NGUYEN, Quoc Trong PHAM, Tran Vy NGUYEN, Takenori YAMAMOTO, Deuanta KONGXAISAVATH, Kaito YAMAZAKI, Maxim S. NURALIEV, Constantin I. FOMICHEV and Phetlasy SOULADETH. 2025. Memecylon longipedunculatum (Melastomataceae), A New Species from Coastal Areas of south central Vietnam. Phytotaxa. 683(1); 1-8. DOI: doi.org/10.11646/phytotaxa.683.1.1 [2025-01-29]
