The system I use is, I hope, rather modern, but since I am no botanist, I am open to suggestions. The division encompasses all plants that multiply by seeds. The gymnosperms, or naked-seeded plants, are the very oldest plants that bear seeds. This subdivision gave rise to many species in the early mesozoicum, but today about half of its classes are extinct. Many modern species live in ecological niches, where they can escape the concurrent Magnoliophytina .
Many species produce odorous balms and resins.
Family Cupressaceae 135 species, distributed over all continents. Mostly trees and shrubs with evergreen needle-shaped leaves. Essential oils are common. The extra protection offered to the seed has enormous advantages and lead to their concurrent dominance over the gymnosperms. Many species contain essential oils.