The Genetic Property of Hybridization on Begonia rex The Genetic Property of Hybridization on Begonia rex Notes on the Species Status of Begonia menglianensis YY. Qian (Begoniaceae) STUDIES ON AMITOSIS OF EPIDERMAL CELL AND SPECIAL EFFECT OF 2, 4-D IN THIN CELL LAYER CULTURE OF Begonia rex-cultorum Notes on the Species Status of Begonia menglianensis YY. Qian (Begoniaceae)