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| Terminalia santisukiana Patthar. & Poopath in Pattharahirantricin & Poopath, 2020. |
ABSTRACT
A new species of Terminalia, Terminalia santisukiana (Combretaceae) from fresh water swamp forest in North-Eastern Thailand is described and illustrated. The new species is similar to Terminalia nigrovenulosa, having similar leaves with glands on the leaf margin near the base and paniculate inflorescences, but it is mainly distinguished by the loose panicles with dense indumentum on the flowers and the 4–5-winged fruits. It is also similar to Terminalia polyantha, having 4–5-winged fruits, but differs by the dense indumentum on the flowers and asymmetrical fruits.
Keywords: Fresh water swamp forest, Sakon Nakhon, Terminalia nigrovenulosa, Terminalia polyantha
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| Figure 1. Terminalia santisukiana Patthar. & Poopath: A. habit; B. gland on margin near base (×20); C. inflorescence; D. flower bud and bract; E. flower, side view (a. lower receptacle, b. upper receptacle); F. dissected flower; G. 4- and 5-winged fruits, top view. All from Poopath et al. FP160 (BKF). Drawn by Mahsarahka Rungkrajang. |
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| Figure 2. Terminalia santisukiana Patthar. & Poopath: A. habitat, the tree is the largest trunk (arrow); B. bark; C. lower surface of glaucous leaves; D. inflorescences; E. infructescences. Photos by Manop Poopath. |
Terminalia santisukiana Patthar. & Poopath, sp. nov.
Similar to Terminalia nigrovenulosa Pierre by similar leaves with glands on their margin near the base and paniculate inflorescences, but differing in its outer bark being smooth or scaly outside, inner bark yellowish brown, loose panicles with a dense indumentum, whitish flowers that are densely pubescent on the outside at the base of the receptacle (lower receptacle) and pubescent inside towards the apex of the receptacle (upper receptacle), and ovoid to broadly ellipsoid (4–)5-winged fruits (versus smooth outer bark with shallow longitudinal streaks, bright orange-red inner bark, compact panicles, pale yellow flowers that are glabrous outside at the base of the receptacle, and oblong, (2–)3-winged fruits in T. nigrovenulosa). It is also similar to Terminalia polyantha C.Presl, from the Philippines, in having 4–5-winged fruits, but it differs in flowers with a dense indumentum on the apex of the receptacle, asymmetrical fruits, and growing in fresh water swamp forest (versus flowers glabrous at the apex of the receptacle, symmetrical fruits, and growing in dry thickets and secondary forests).
Ecology.— Fresh water swamp forest, along the Nam Un River, branch of the Songkhram River, a tributary of the Mekong River; ca 150 m alt.
Vernacular.— Khi ai nam (ขี้อ้ายน้ำ), saeng kham tham (แสงคําทาม), saen kham tham (แสoคําทาม) (General).
Etymology.— The species is named in honour ofthe late Prof. Dr Thawatchai Santisuk (1944–2020),who was an editor of the Thai Forest Bulletin (Botany)(1991–2013) and Editor-in-Chief of the Flora of Thailand (1997–2013).
Nannapat Pattharahirantricin and Manop Poopath. 2020. Terminalia santisukiana (Combretaceae), A New Species from North-Eastern Thailand. Thai Forest Bulletin (Botany). 48(2); 199-203. DOI: 10.20531/tfb.2020.48.2.12
