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Sonerileae) • A New Species from the Truong Son Mountain Range, Vietnam | Mio Kitchen


Abstract

Sonerila quangnamensis, a new species from Truong Son Mountain Range, Vietnam, is described and illustrated here. Like S. plagiocardia, S. quangnamensis has obliquely ovate leaves, which are unequal in size within each pair. However, S. quangnamensis is obviously distinct in several characters: the cross-section of its stems and petioles is terete (vs. 4-winged), the adaxial surface of its leaves is covered with hispidulous-pilose (vs. puberulous), the hypanthium is unribbed (vs. 6-ribbed), and its anthers are uniformly yellow (vs. purple to purplish-pink, yellow-tinged towards the base).

Keyword: biodiversity, endemism, Indochina, Sonerila plagiocardia, Sonerila montana, taxonomy

Sonerila quangnamensis K.S.Nguyen, H.H. Truong, Aver. & C.W.Lin.
A. Habit; B, B’. Portion of leaf, abaxial and adaxial surfaces; C, C’. Flower, front and side views; D. Bract; D’. Leaf-like bract; E. Longitudinal section of ovary; F, F’. Stamens, ventral and lateral views; G. Style and stigma.

Sonerila quangnamensis K.S.Nguyen, H.H. Truong, Aver. & C.W.Lin.
A, B. Habits; C. Stem, also showing petioles; D. Petiole; E, F. Portion of leaf, adaxial surface; G, H. Portion of leaf, abaxial surface; I. Inflorescence (flowers fall off), showing leaf-like bract; J. Inflorescence, also showing longitudinal section of ovary; K. Flower; L. Longitudinal section of ovary, also showing bracts (pointed out by the red arrow); M. Longitudinal section of an immature fruit; N. Infructescence; O. Mature fruit, top view, P. same, lateral view.

Photo A by H.H. Truong.

Sonerila quangnamensis K.S.Nguyen, H.H.Truong,
Aver. & C.W.Lin, sp. nov.

Diagnosis: Resembling S. plagiocardia in its obliquely ovate foliage, S. quangnamensis clearly differs in several key characteristics. It has terete (vs. 4-winged) stems and petioles, hispidulous-pilose (vs. puberulous) adaxial leaf surface, unribbed (vs. 6-ribbed) hypanthium, and uniformly yellow (vs. purple to purplish-pink, yellow-tinged towards the base) anthers.

Etymology: The specific epithet refers to its type locality, Quang Nam province. The Vietnamese name “Sơn linh quảng nam” is proposed.

 

Khang Sinh Nguyen, Hoang Hap Truong, Van Tien Tran, Leonid V. Averyanov and Che Wei Lin. 2024. Sonerila quangnamensis (Tribe Sonerileae, Melastomataceae), A New Species from the Truong Son Mountain Range, Vietnam. Taiwania.  69(3); 288-293. DOI: 10.6165/tai.2024.69.288

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