A tree consists of numerous branches whose shoots may or may not carry an inflorescence which consist of an aggregation of flowers. To understand the sex expression of a tree population one has to examine the sex expression at the level of the flower, the inflorescence, the individual and finally the population.
Asexual flowers occur on some inflorescences at the end of the flowering sequence.
In the following, all functionally male or female flowers will be described as male or female flowers. Flower types in sycamore. Some sycamore inflorescences bear male flowers only, but generally both sexes are represented. Usually inflorescences start flowering with a sequence of male or female flowers and then switch to the other sex. The mode of sex expression of individuals is similar, but is a mixture of the above modes of sex expression.