Which type of flower contains only male or female parts?

Imperfect flowers are characterized by the presence of either male or female reproductive organs, but not both. This means that they will contain either stamens (the male part that produces pollen) or pistils (the female part that contains ovules), but not both, making them functionally unisexual.

In contrast, complete flowers contain all four main floral structures: sepals, petals, stamens, and pistils. Perfect flowers, on the other hand, include both male and female reproductive parts, which allows them to produce both pollen and ovules. Compound flowers refer more to flower clusters or arrangements rather than the reproductive structures of individual flowers.

Thus, imperfect flowers serve as a prime example of sexual dimorphism in flowering plants, where species can be categorized based on the sex of their flowers, promoting various reproductive strategies including cross-pollination.