The distribution of male and female inflorescences among stems ofMyrica gale L. is strongly bimodal and indicates a genetical dimorphism in gender. Predominantly or strictly male stems are about twenty times as frequent as predominantly or strictly female stems. There is considerable variation among male and female stems in their precise gender. Quantitative values of the phenotypic sex (the observed gender based on the relative proportions of male and female inflorescences) and functional sex (the relative probabilities of transmitting genes to descendants through male and female gametes) of samples of stems are estimated.