1. In red clover the basic dominant flower-colour factor (C) is a simple dominant to the pure white factor (c). 2. The basic recessive factor (c) is epistatic to all the other known flower-colour factors (with the exception ofCp gene), and to the anthocyanin factors. 3. The factor pairC/c is linked with the incompatible allelomorphsS 1, S1, S2, etc. 4. The mean cross-over value forS andC factors is about 35 per cent.