Begonia baikandB. padawanensisspp. nov. (Begoniaceae) from sandstone areas in Sarawak, Malaysia

Two new species of Begonia (Begoniaceae), B. baik and B. padawanensis, from Sarawak are described and illustrated. Begonia baik, a member of sect. Petermannia, resembles B. conipila, but is distinguishable by having glabrous ovary (vs sparsely hispid) and margins of bracts dentate and glandular hairy (vs entire). Begonia padawanensis (sect. Reichenheimia) is similar to B. andersonii, differing in the leaves being obtriangular-spatulate (vs orbicular) and having 5 pistillate flower tepals (vs 4). Both new species were discovered in a sandstone area in Padawan, Sarawak.