[Botany • 2023] Begonia kayinensis (Begoniaceae, sect. Monophyllon) • A remarkable New Species from Kayin State, Southern Myanmar [Taxonomic Studies on Begonia in Myanmar III]

Begonia kayinensis M.B.Maw & Y.H.Tan, 

in Maw, Hein, Naing, Yu et Tan, 2023.

   taiwania.NTU.edu.tw/abstract/1956

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Abstract

Begonia kayinensis, a new species from Kayin State, Myanmar is described and illustrated. This new species is identified as a member of Begonia section Monophyllon A.DC. in its morphological characteristics including the upright stem with tuber, inflorescences arising from the top of the stem, and 2-loculed ovary. A description, photographs, illustration, and comparison with allied species in sect. Monophyllon and provisional assessment of the conservation status are provided.

Keyword: Begonia sect. Monophyllon, Begonia prolifera, citizen science, Myanmar, new taxon, tuberous

Begonia kayinensis M.B.Maw & Y.H.Tan, sp. nov.
A. Habit; B. Pistillate flower; C. Staminate flower; D. Styles and stigmas; E. Androecium; F. Ovary transverse section; G. Pistillate flower bud; H. A stipule pairs.

Drawn by Hai-Yao Chen.

   

 

Begonia kayinensis M.B.Maw & Y.H.Tan, sp. nov.
Hpa-an District, Kayin State, Myanmar.
A-C. Habit; D-E. Inflorescence; F. Plants with scale; G. Tuber; H. A stipule pairs; I. Androecium; J. Styles and stigmas; K. Ovary transverse section.

 Photos by: A, B, H. M.K.Naing; CE. T.N. Tun; F, G. M.B. Maw; I-K. K.Z. Hein; 

Begonia kayinensis M.B.Maw & Y.H.Tan, sp. nov.

 (section Monophyllon) 

Diagnosis. Begonia kayinensis is most similar to Begonia prolifera A.DC. in having an erect stem, globose tuber with fibrous roots, a single sessile leaf and free styles, but it can be significantly distinguished from the latter by having bullate upper lamina (vs. relatively flat), deep red (vs. light green) lower lamina, and stamens numerous 25–30 (vs. 10–13).

Etymology. The specific epithet of the new species refers to Kayin state where the type is collected. 

Vernacular. Kayin kyaway pann

Ecology. It grows on shaded, moist limestone surface, exposed limestone and cave entrance at an elevation of around 80 m a.s.l.

Mya Bhone Maw, Khant Zaw Hein, Min Khant Naing, Wen-Bin Yu and Yun-Hong Tan. 2023. Taxonomic Studies on Begonia (Begoniaceae) in Myanmar III: Begonia kayinensis (sect. Monophyllon), A remarkable New Species from Kayin State, Southern Myanmar. Taiwania. 68(4); 407-411 DOI: 10.6165/tai.2023.68.407 

  taiwania.NTU.edu.tw/abstract/1956

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