The micromorphological characters of seeds of Begonia solananthera, B. integerrima and B. procumbens provide additional arguments for the delimitation of Begonia Sect. Solananthera. The seeds clearly deviate from those of most sections of Begonia . The scobiform seeds have air-filled testa cells with bulging outer cell walls on their micropylar part, and depending on the species, also on their chalazal and central parts. These characters are interpreted as adaptations to wind dispersal and compared with trends in some other epiphytic Begonias.