One new species and one new record of Begonia from Xizang of China

Southern Xizang harbors the highest diversity of plants in Xizang of China, and recently there have been many new species discovered in this region. Based on field surveys and review of literature and herbarial specimens, one new species (Begonia renqinbengensis D.K.Tian & W.G.Wang) and one new record (B. leptoptera Hara) of Begonia are diagnosed and reported in this paper. Also B. leptoptera is redescribed with illustrations. The conservation statuses of two species are assessed according to Guidelines for Using the IUCN Red List Categories and Criteria.