RTalk about the class of coniferopsida.

Largest and most widespread among gymnosperms, Pine, Fir, Spruce, Larch, Cypress... They are named conifers because their reproductive organs are grouped inside unisexual cones composed of scales. The leaves are either tough needles or scale like well adapted to drought. The xylem of conifers is composed of tracheids. Resin canals are found in stems and leaves, hence the appelation of resinous. Most of them are evergreen (3 remains green by growing leaves along all year long as other leaves fall off.) few are deciduous (lose leaves in autumn) They are generally monoecious (trees hold male and female reproductive system) but some species are dioecious.