Abstract
A sterile, stoloniferous hybrid (2n = 32) between Caucasian clover, Trifolium ambiguum (2n = 4x = 32) ♀ and white clover, T. repens ♀ has been produced with the aid of embryo culture using transplanted nurse endosperm. Vegetatively the hybrid strongly resembles T. repens, but several vegetative and floral characters are modified towards T. ambiguum. Hybridity is supported by the presence of heterologous nucleolus-organising chromosomes and by the results of gel electrophoresis of leaf isozymes.