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| Nymphanthus namkadingensis Tk.Yamam., Tagane & Soulad., in Yamamoto, Souladeth, Phonepaseuth, Kongxaisavath, Vongthavone, Vuong, Trong, Souvannakhoummane et Tagane, 2024. |
Abstract
A new species of Nymphanthus (Phyllanthaceae), N. namkadingensis from Bolikhamxai Province, central Laos, is described and illustrated, along with its vernacular name and preliminary conservation status. The new species is similar to N. rubescens, but distinguished by having larger stipules, longer pedicels, and connate annular disc glands (vs. free disc glands) of pistillate flowers.
Key words: flora, Indochina, Malpighiales, Phyllantheae, taxonomy
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| Nymphanthus namkadingensis Tk.Yamam., Tagane & Soulad. (A, E–G, I–M. Tagane et al. Z74; B–D. Souladeth et al. Z595; H. Tagane et al. Z128). A. Habitat; B. Habit; C, D. Portion of floriferous branchlet showing adaxial and abaxial leaf surfaces respectively; E. Abaxial leaf surface; F. Stipule; G. Staminate flower (front view); H. Staminate flowers (lateral view); I. Enlarged view of staminate flower showing stamens and disc glands; J. Pistillate flower (lateral view, sepals detached); K & L. Ovary (lateral view & overhead view, respectively); M. Fruit just before dehiscence. Abbreviations: an, theca of anther; dp, disc gland of pistillate flower; ds, disc gland of staminate flower; ov, ovary, sy, style. Scale bars E = 5 mm, F = 3 mm, I–L = 0.5 mm, and M = 1 mm. Photos: T. Yamamoto (A, E, F, I–M), K. Souvannakhoummane (B), P. Souladeth (C, D), and S. Tagane (G, H). |
Nymphanthus namkadingensis Tk.Yamam., Tagane & Soulad., sp. nov.
Nymphanthus namkadingensis is distinguished from the other members of Nymphanthus by having combination of
following features: branches and branchlets glabrous, stipules of 3–9 × 1–2 mm, ovate-lanceolate laminae of 14–25 ×
5–8 mm with 8–12 pairs of lateral veins, reddish purple sepals with slightly undulate (non-fimbriate) margins, annular
disc glands of pistillate flowers, and glabrous ovaries. Among Nymphanthus species distributed in Laos and its adjoining
countries, the new species is most similar to N. rubescens distributed in Laos and Vietnam in having floriferous
branchlets rather congested near ...
Etymology:—The specific epithet namkadingensis is derived from Nam Kading National Protected Area, in
which the species was first discovered.
Vernacular name:— ໝາກຍົມນ້ອຍນ້ຳກະດິງ [Mak yom noy namkading (“Mak yom” means Nymphanthus species
in general in Lao; “noy” means small fruit), suggested here].
Takenori Yamamoto, Phetlasy Souladeth, Phongphayboun Phonepaseuth, Deuanta Kongxaisavath, Thyraphon Vongthavone, Truong Ba Vuong, Pham Quoc Trong, Keooudone Souvannakhoummane and Shuichiro Tagane. 2024. Nymphanthus namkadingensis, A New Species of Phyllanthaceae from Laos. Phytotaxa. 650(3); 199-205. DOI: 10.11646/phytotaxa.650.3.1