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| Nymphanthus adenophorus Tk.Yamam., Tagane & V.S.Dang in Yamamoto, Dang, Souladeth et Tagane, 2025. |
Abstract
A new species of Nymphanthus (Phyllanthaceae), N. adenophorus from Ninh Thuan Province, central Vietnam, is described and illustrated, along with its vernacular name and preliminary conservation status. The new species is similar to N. pireyi and N. nanellus, but distinguished by its terete and shorter floriferous branchlets with fewer leaves, larger leaf blades, faintly visible lateral veins, longer pedicels of male flowers, and accordion-folded discs of pistillate flowers.
flora, Indochina, Malpighiales, Phyllantheae, taxonomy, Eudicots
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| Nymphanthus adenophorus Tk.Yamam., Tagane & V.S.Dang (from Tagane et al. N226). A. Habit; B, C. Floriferous branchlets showing adaxial and abaxial leaf surfaces respectively; D. Enlarged view of a part of a floriferous branchlet showing stipules; E. Lateral view of a staminate flower. One of four sepals was detached to show the internal morphology; F, G. Overhead view of a staminate flower. Sepals were detached in G to show four foveolate discs; H. Diagonally overhead view of a pistillate flower; I. Lateral view of a pistillate flower; J. Enlarged view of a young ovary with one of three bifid stigmas (the rest of two were destroyed during dissection); K. Young fruit. Abbreviations: an, theca of anther; dc, floral disc; ov, ovary; sp, stipule. All scale bars = 0.5 mm. All photos taken by T. Yamamoto. |
Nymphanthus adenophorus Tk.Yamam., Tagane & V.S.Dang, sp. nov.
Among Nymphanthus species distributed in Vietnam and adjoining countries, N. adenophorus is similar to N. pireyi
(endemic to Central Vietnam) and N. nanellus (endemic to South China) in having small leaf blades (≤ 1 × 1
cm) of ovate, suborbicular to obovate shapes, sepals of both staminate and pistillate flowers with non-fimbriate
margins, and pistillate flowers bearing connate (not free) discs surrounding the lower portion of the ovary. However,
the new species can be clearly ...
Etymology:—The specific epithet adenophorus is derived from the presence of many distinct glands on floral
discs.
Vernacular name:—Diệp hạ châu núi chúa.
Takenori YAMAMOTO, Van-Son DANG, Phetlasy SOULADETH and Shuichiro TAGANE. 2025. Nymphanthus adenophorus, A New Species of Phyllanthaceae from Vietnam. Phytotaxa. 683(1); 18-24. DOI: doi.org/10.11646/phytotaxa.683.1.3
