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. 2021 Jun 17:179:1-12.
doi: 10.3897/phytokeys.179.65812. eCollection 2021.

Begonia catbensis (sect. Coelocentrum, Begoniaceae), a new species from northern Vietnam

Li-Na Dong  1 , Khang Sinh Nguyen  2 , Yu-Min Shui  3 , Hieu Quang Nguyen  4 , Wei-Bin Xu  1 , Xuan Khu Nguyen  5
Affiliations

Begonia catbensis (sect. Coelocentrum, Begoniaceae), a new species from northern Vietnam

Li-Na Dong et al. PhytoKeys. .

Abstract

Begonia catbensis, a new species in Begonia sect. Coelocentrum is described and illustrated. The new species was discovered in lowland limestone hills at Cat Ba National Park and can be easily distinguished from all its congeners by having dendritic hairs on the petiole, adaxial veins and stipules, fimbriate bracts and bracteoles, dense conical bullae on the upper surface of the leaf blade, two tepals in the pistillate flowers and a glabrescent ovary with verrucose wings. Based on IUCN Criteria, the species is currently assessed as "Endangered" (D).

Keywords: Begonia; Cat Ba; Vietnam; endangered plant; new species.

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Figures

Figure 1.
Figure 1.
Begonia catbensisA plants growing on rocks in the wild B habit C apical shoot bearing stipules D young leaf, abaxial view E part of adaxial leaf surface showing bullae, setae and palmate veins F dendritic hairs on petiole and abaxial veins G portion of leaf showing reddish setae on bullae and along margin. Photos and layout by K.S. Nguyen & L.N. Dong.
Figure 2.
Figure 2.
Begonia catbensisA apical part of inflorescence showing peduncle, pedicel, bracts, bracteoles, staminate and pistillate flowers B staminate and pistillate flowers C staminate flower (upper) in front view D stamens E pistillate flower-top view F pistillate flower, lateral view G dissected styles and stigmas H fruits and their cross-cut. Photos and layout by K.S. Nguyen & L.N. Dong.
Figure 3.
Figure 3.
Distribution map of Begonia catbensis and its closest related species (The map is modified from https://en.wikipedia.org/wiki/Mainland_Southeast_Asia).
See this image and copyright information in PMC

References

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