Abstract
Since 2016, KIB (Kunming Institute of Botany) and CPC (Centre for Plant Conservation of Vietnam) have conducted several surveys in the transboundary karst regions in Northern Vietnam and Southern China and seven new species in the genus Begonia Linn. (Begoniaceae) are firstly described. Amongst them, two species, Begonia albopunctata Y.M. Shui, W.H. Chen & H.Q. Nguyen and B. erectocarpa H.Q. Nguyen, Y.M. Shui & W.H. Chen, respectively belong to section Sphenanthera with berry fruits and section Leprosae with clavate berry fruits; four species, B. gulongshanensis Y.M. Shui & W. H. Chen, B. minissima H.Q. Nguyen, Y.M. Shui & W.H. Chen, B. mollissima Y.M. Shui, H.Q. Nguyen & W.H. Chen, B. rhytidophylla Y.M. Shui & W.H. Chen, belong to section Coelocentrum with parietal placentation; one species, Begonia bambusetorum H.Q. Nguyen, Y.M. Shui & W.H. Chen, belongs to section Diploclinium with 3-loculed ovary and capsules. The diagnostic characters of these species are described and illustrated in the text and photographs.
Highlights
The Tonkin region is one of the biodiversity hotspots worldwide (Takhtajan 1986; Myers et al 2000) that include Northern Vietnam and Southern China (Fig. 1)
The floristic region mainly covers the northernmost region from the North-west to North-east in Vietnam (Takhtajan 1986; Averyanov et al 2003) that borders with the South-western Guangxi and South-eastern Yunnan in China (Wu and Wu 1998)
In the last ten years, a large number of new species in different families have been discovered in the region, such as Begoniaceae, Gesneriaceae, Magnoliaceae etc. (Averyanov and Nguyen 2012; Chen et al 2017; etc.)
Summary
The Tonkin region is one of the biodiversity hotspots worldwide (Takhtajan 1986; Myers et al 2000) that include Northern Vietnam and Southern China (Fig. 1).
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