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| Paraboea villosa Aver., W.B. Xu & K.S. Nguyen
in Averyanov, Xu, Nguyen & Maisak, 2020.
Taiwania. 65(1)
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Abstract
Based on morphological data, Paraboea villosa from limestone areas of northern Vietnam is described and illustrated as a new species. It is similar to Paraboea middletonii Triboun, P. rufescens (Franch.) B.L. Burtt and P. umbellata (Drake) B.L. Burtt, but differs in its almost ebracteate inflorescence, small white flowers, very short peduncles, absence of staminodia, bright yellow, swollen, gibbous filaments and large anthers.
Keyword: Flora of Vietnam, Gesneriaceae, limestone endemism, Paraboea villosa, plant diversity, plant taxonomy
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| Fig. 1. Paraboea villosa Aver., W.B. Xu & K.S. Nguyen. A: Habit. B: Inflorescences. C: Lower surface of leaf. D: A part of leaf blade showing upper and lower surface and margin. E: Flower face view. F: Flower side view. G: Opened corolla showing stamens. H: Opened corolla showing stamens and pistil. I: Pistil and calyx. J: Stamens back view. K: Stamens face view.
All photos taken by L. Averyanov & T. Maisak, and designed by Z.C. Lu.
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Paraboea villosa Aver., W.B. Xu & K.S. Nguyen, sp. nov.
Diagnosis: Paraboea villosa is similar to Paraboea middletonii Triboun, P. rufescens (Franch.) B.L. Burtt and P. umbellata (Drake) B.L. Burtt in its leaves dense brownish woolly indumentum and congested compound dichasium, but differs in its almost ebracteate inflorescence, small white flowers, very short peduncles, absence of staminodia, bright yellow, swollen, gibbous filaments and large anthers.
Etymology: Species epithet refers to the characteristic villous indumentum of the stem, leaf petioles and inflorescence peduncles.
Ecology, habitat and conservation status: Primary coniferous forests with Pseudotsuga brevifolia on karstic limestone at elevation of about 1300 m a.s.l., commonly in shady places on middle part of mountain slopes. Locally common. Since no special surveys were carried out for delimiting its distribution, and the information about threat is unclear, so this species was considered as meeting the criteria of Data Deficient (DD) in terms of IUCN Red list categories and criteria (IUCN, 2017).
Notes: Within the genus Paraboea, this new species belongs to the group of species with campanulate corollas, axillary congested cymes and an enantiostylous arrangement of stamens and pistil. Among the members of this group, it is most similar to Paraboea iTriboun, which is endemic to northern Thailand, and also similar to P. rufescens (Franch.) B.L. Burtt and P. umbellata (Drake) B.L. Burtt, which distribute from southern China to northern Vietnam. More detailed comparison between the new species and another similar species are presented in Table 1.
Leonid V. Averyanov, Wei Bin Xu, Khang Sinh Nguyen and Tatiana V. Maisak. 2020. Paraboea villosa (Gesneriaceae), A New Species from Northern Vietnam. Taiwania. 65(1); 33-36. DOI: 10.6165/tai.2020.65.33
