Two new species of Begonia sect. Coelocentrum, B. guixiensis and B. longa, from Sino-Vietnamese limestone karsts.

Background: In our recent molecular phylogenetic study of Asian Begonia, two undescribed species, B. guixiensis sp. ined.

Begonia wuzhishanensis (sect. Diploclinium, Begoniaceae), a new species from Hainan Island, China.

Background: Hainan is the largest island of the Indo-Burma Biodiversity Hotspot and has the best preserved and most extensive tropical forests in China. A recent study on distribution of endangered species in China identifies southern Hainan as one of eight hotspots for plant conservation in the country. In continuation of our studies of Asian Begonia, we report the discovery of an attractive undescribed species, B.