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).

中文翻译：

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Begonia catbensis (sect. Coelocentrum, Begoniaceae)，越南北部新种

Begonia catbensis，海棠科新种。描述和说明了腔心。这一新种是在吉婆国家公园的低地石灰岩丘陵中发现的，通过在叶柄、正脉和托叶、流苏状苞片和小苞片上有树突状毛、在上表面有致密的圆锥形大疱，可以很容易地将其与所有同类物区分开来。叶片，雌花中的两个花被片和带有疣状翅的后脱落子房。根据 IUCN 标准，该物种目前被评估为“濒危”（D）。