Friday, August 21, 2020

[Botany • 2020] Begonia colliculata (Begoniaceae: Section Platycentrum) • A New Species from Nam Kading National Protected Area, Bolikhamxai Province, Laos


Begonia colliculata  Souvann. & Lanors.

in Souvannakhoummane, Lanorsavanh, Park, et al., 2020.
ສົ້ມກຸ້ງແດງ  ||  DOI: 10.20531/tfb.2020.48.2.04 

ABSTRACT
Begonia colliculata is described and illustrated with photographs from Nam Kading National Protected Area, in the Bolikhamxai Province of Laos.

Keywords: Begonia, Biodiversity, Laos, new taxon, taxonomy


Figure 1. Begonia colliculata Souvann. & Lanors.:
A habit; B. stipule; C. pistillate flowers, front view; D. pistillate flowers, lateral view; E. styles and stigma; F. cross section of fruit; G. staminate flowers, front view; H. staminate flowers, back view; I. stamens; Drawn by K. Souvannakhoummane from SL1999 (HNL).


Figure 2. Begonia colliculata Souvann. & Lanors.:
 A habit; B. staminate inflorescence; C. pistillate inflorescence; D. fruit, lateral view; E. pistillate flower, front view; F. pistillate flower, lateral view; G. staminate flowers, back view; H. staminate flowers, front view;
 scale bar: 1 cm; photo by S. Lanorsavanh from SL1999 (HNL).

Begonia colliculata Souvann. & Lanors., sp. nov.
(Section Platycentrum). 

Begonia colliculata is similar to Begonia hekouensis S.H.Huang, but differs in having ver-rucous peduncles (vs densely villous), bracts with a strigose margin (vs ciliate), sparsely strigose tepals (vs villous), a sparsely strigose and colliculate ovary with a broadly falcate-elongate dorsal wing (vs densely purplish brown villous and not colliculate, dorsal wing ligulate). It is also similar to B. croceaC.-I Peng but differs in having a cane-like stem (vs stemless), leave blade ovate-lanceolate (vs broadly ovate), inflorescences arising from axils on the stem (vs arising directly from the horizontal rhizome) and anthers elliptic-oblong, apex rounded (vs fusiform-obovate, apex acuminate) (Table 1).


Entomology.— The specific epithet “colliculata”refers to the colliculate surface of the ovary and fruit.
Vernacular.—  ສົ້ມກຸ້ງແດງ - Som koung deang  (Red begonia).


Keooudone Souvannakhoummane, Soulivanh Lanorsavanh, Jeong Ho Park, Ho Sang Kang, Tai Hyeon Ahn, Singkone Xayalath and Chanhsamone Phongoudom. 2020. Begonia colliculata (Begoniaceae), A New Species from Nam Kading National Protected Area, Bolikhamxai Province, Laos. Thai Forest Bulletin (Botany). 48(2); 108-113. DOI: 10.20531/tfb.2020.48.2.04

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