Why is a pine tree considered to be more similar to the hibiscus plant than to a fern?

Gymnosperms, such as pine trees, and angiOSperms, such as hibiscus, both sport an important evolutionary feature that ferns do not. Gymnosperms and angiOSperms both make seeds through sexual reproduction, while ferns produce spores through a type of asexual reproduction. (the latin Word sperma means seed.)