A flowering plant from the Siang River basin in Upper Siang District, Arunachal Pradesh, at about 600 m, found in a single shaded stream habitat. It creeps along the ground, with solid dark green leaves that carry blister-like bumps beneath, pale-pink flowers and three-winged ovaries with nearly equal wings. It is known only from that one habitat and has been provisionally assessed as Data Deficient. News article: https://researchmatters.in/news/distinctive-new-wild-flower-begonia-siangensis-discovered-in-arunachals-siang-valley