Reciprocal crosses between Primula vulgaris Oakleaf pin and Oakleaf thrum plants to assess viability of Oakleaf homozygotes. The results of reciprocal crosses between a P. vulgaris Oakleaf thrum, with OKL in coupling with the dominant S allele, and an Oakleaf pin, with OKL in coupling to the recessive s allele, are presented. (a) Cross 5, Oakleaf thrum as female parent. (b) Cross 6, Oakleaf pin as female parent. The phenotypes and genotypes, with respect to leaf shape (wild‐type or Oakleaf), and the S locus (pin or thrum) of parent plants are indicated. The number of F1 progeny of each phenotype, classified with respect to leaf phenotype, and their predicted genotypes are shown; progeny were not scored with respect to flower morph.